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(Click for frequent words.) 68 electron beam computed tomography 66 transesophageal echocardiography 66 transcranial Doppler 65 computerized tomography scan 65 Doppler ultrasound 65 Doppler echocardiography 64 fundus photography 63 coronary CTA 63 spiral computed tomography 63 colonography 63 electrocardiogram EKG 63 MDCT angiography 62 transabdominal 62 Skin sterol 62 computed tomographic 62 Doppler ultrasonography 62 coronary calcium 62 perfusion MRI 62 radiofrequency catheter ablation 62 transcranial Doppler ultrasound 62 multidetector row 62 chest radiographs 61 coronary artery calcium 61 cardiac perfusion 61 Computed Tomography CT scans 61 intima media thickness 61 myocardial viability 61 perfusion imaging 61 Coronary artery calcium 61 FDG-PET/CT 61 helical CT 60 transient elastography 60 Bone density 60 stress echocardiography 60 Functional magnetic resonance 60 Computed tomography 60 CT angiography 60 electroencephalographic 60 carotid bruit 60 abdominal ultrasound 60 arteriography 60 arthrography 60 cardiac troponin 60 immunohistochemical 60 pretest probability 60 transvaginal sonography 60 stratifying patients 60 CT coronary angiography 60 intima media thickness IMT 60 glaucomatous 60 DEXA dual 60 Echocardiogram 60 angiographically 60 subclinical atherosclerosis 60 otoacoustic emissions 60 computed tomography scans 60 transesophageal echocardiogram 60 chest radiography 59 FDG PET CT 59 computerized tomographic 59 DEXA scan 59 electromyographic EMG 59 Abdominal ultrasound 59 electroencephalograms 59 colonoscopic 59 EBCT 59 transthoracic 59 audiometric 59 cerebral angiogram 59 transesophageal echocardiography TEE 59 Prostate Specific Antigen PSA 59 near infrared spectroscopy 59 histopathologic examination 59 Ultrasonographic 59 echocardiographic 59 conventional coronary angiography 59 silent myocardial ischemia 59 Corus CAD 59 densitometry 59 tonometry 59 Positron emission tomography PET 59 electrocardiography 59 immunochemical 59 genomewide 59 Magnetic resonance 59 multislice 59 computerized tomography scans 59 exhaled nitric oxide 59 nuchal translucency 59 esophageal manometry 59 underwent coronary angiography 58 pelvic ultrasound 58 myocardial perfusion 58 pulsed Doppler 58 computed tomographic scans 58 coronary angiogram 58 electrocardiographic 58 electroencephalogram EEG 58 Coronary angiography 58 electrocardiogram ECG 58 carotid intima media 58 COR Analyzer 58 electroencephalogram 58 electrophysiological 58 transesophageal 58 electroencephalographic EEG 58 ECG gated 58 coronary CT angiography 58 noninvasive ultrasound 58 angiography CTA 58 coronary computed tomography 58 Computed tomographic 58 spirometry 58 mammographic 58 fasting lipid 58 PiB PET 58 noninvasive imaging 58 carotid artery ultrasound 58 CT angiogram 58 tissue perfusion 58 core needle biopsies 58 ultrasonographic examination 58 transthoracic echocardiography 58 CT angiograms 58 troponins 58 adnexal masses 58 semiquantitative 58 procalcitonin 58 Vizilite 58 thyroglobulin 58 multidetector CT 58 diagnostic modality 58 FDG PET scans 58 excisional biopsy 58 Ankle Brachial Index 58 Angiographic 58 Color Doppler 58 Liver biopsy 58 Ultrasound imaging 57 dyssynchrony 57 venography 57 conventional angiography 57 VATS lobectomy 57 lung nodule 57 noninvasive technique 57 F FDG PET 57 coronary arterial 57 Cystoscopy 57 audiometry 57 percutaneous biopsy 57 intravascular ultrasound 57 cardiac troponin T 57 DCE MRI 57 imaging FMRI 57 FibroScan 57 invasive coronary angiography 57 arteriogram 57 VCUG 57 Afib 57 SPECT imaging 57 slit lamp 57 coronary stenosis 57 transrectal ultrasonography 57 functional MRI fMRI 57 Carotid artery 57 pre operatively 57 ophthalmoscopy 57 invasive angiography 57 Virtual colonoscopy 57 carotid artery stenosis 57 painless ultrasound 57 transcranial magnetic stimulation TMS 57 DXA 57 Doppler sonography 57 variant angina 57 convergent validity 57 abdominal computed tomography 57 MSCT 57 electron beam tomography 57 coronary angiography 57 electrophysiologic 57 oncologic outcomes 57 auscultation 57 pulmonary angiography 57 contrast echocardiography 57 EUS FNA 57 upper endoscopy 57 intracardiac 57 color Doppler ultrasound 57 carotid IMT 57 eNO 57 CT colonography CTC 57 angiography CCTA 57 Electrocardiogram ECG 57 transrectal ultrasound 56 PET CT scanning 56 Echocardiographic 56 carotid stenosis 56 Hemoccult II 56 DEXA scans 56 Elastography 56 auditory brainstem response 56 chest radiograph 56 Multivariate logistic regression 56 Coronary CTA 56 Sonographic 56 ankle brachial index 56 color Doppler sonography 56 spontaneous regression 56 color Doppler 56 coronary artery calcification 56 ultrasonographic 56 radiographic imaging 56 optical coherence tomography 56 Spirometry 56 logistic regression analyzes 56 nondiagnostic 56 neuropsychological assessment 56 histopathologic 56 rotational angiography 56 cCTA 56 endoscopist 56 thermogram 56 catheter angiography 56 digital subtraction angiography 56 perfusion CT 56 abnormal EKG 56 perfusion defects 56 positron emission tomography scans 56 diffusion tensor imaging 56 hepatic lesions 56 spirometric 56 urine cytology 56 ductal lavage 56 vessel occlusion 56 thickness IMT 56 perimetry 56 Endoscopic ultrasound 56 methacholine challenge 56 elective PCI 56 Positron emission tomography 56 coronary arteriography 56 sonographic 56 Histologic 56 troponin T 56 bone density scans 56 EBUS 56 polysomnography PSG 56 polyp detection 56 BSGI MBI 56 intact parathyroid hormone 56 carotid artery thickness 56 CT perfusion 56 FFR measurements 56 polysomnography 56 electroencephalograph 56 electromyogram 56 diagnosing coronary artery 56 esophagogastric 56 Multiple logistic regression 56 asymptomatic carotid stenosis 56 USPSTF recommends 56 Transesophageal 56 digital rectal examination 56 angioplasty stenting 56 anthropometric measurements 56 manometry 56 Cardiac catheterization 56 EndoPAT 56 Capsule endoscopy 56 LVRS 56 Echocardiograms 56 Pfizer reanalyzed 56 computerized tomography 56 immunohistochemical staining 55 magnetic resonance angiography 55 functional neuroimaging 55 cTnT levels 55 hematopoietic cancers 55 artery stenosis 55 conditional logistic regression 55 DXA scan 55 sentinel lymph node biopsy 55 morphologic 55 bone density measurements 55 ERCP 55 NIR spectroscopy 55 guided percutaneous 55 coronary endothelial 55 ultrasonography 55 laser Doppler 55 dobutamine stress 55 Visual Analogue Scale VAS 55 abdominal ultrasounds 55 EEG electroencephalogram 55 endoscopic retrograde 55 gated SPECT 55 induced sputum 55 inotropic agents 55 Functional MRI 55 anthropometry 55 coronary blockages 55 obstructive coronary 55 EQ 5D 55 Coronary artery calcification 55 Magnetic resonance imaging 55 computed tomography SPECT imaging 55 electromyographic 55 EEGs 55 spectrophotometric 55 thrombolytic therapy 55 endometrial biopsy 55 Ultrasonography 55 endoscopic ultrasound EUS 55 electrocardiograms ECG 55 State Examination MMSE 55 carotid artery blockage 55 actigraphy 55 Subgroup analysis 55 MR spectroscopy 55 obstructive CAD 55 abdominal aneurysms 55 SPECT MPI 55 rtPA 55 functional MRIs 55 magnetoencephalography MEG 55 ShearWave Elastography 55 total cholesterol HDL 55 cardiac CT angiography 55 dosimetric 55 diagnostic angiography 55 hydroxy vitamin D 55 cytologic 55 nonpharmacologic 55 thickness CIMT 55 GeneSearch BLN Assay 55 QEEG 55 cystoscopic 55 corneal thickness 55 Cardiorespiratory fitness 55 polysomnogram 55 mammographically 55 positron emission 55 MDCT 55 cardiac auscultation 55 electroencephalograph EEG 55 overnight polysomnography 55 stent stenosis 55 pressure monitoring ABPM 55 lipid lowering therapy 55 sonographic evaluation 55 urodynamic studies 55 coronary artery stenosis 55 electroretinography 55 FENO 55 urine dipstick 55 skin sterol 55 histopathological 55 Kruskal Wallis test 55 tissue oxygenation 55 subclinical disease 55 duplex ultrasonography 55 balloon dilation 55 proliferative retinopathy 55 abdominal pelvic 55 Flexi Scope 55 D dimer 55 computed tomography scan 55 Randomized clinical trials 55 undergoing colonoscopy 55 HER2 expression 55 plain radiographs 55 multivariate logistic regression 55 multislice CT 55 transrectal ultrasound guided 55 liver biopsy 55 scintigraphic 55 advanced neoplasia 55 flexible sigmoidoscopy 55 bronchoscopic 55 magnetic resonance spectroscopy MRS 55 coronary catheterization 55 hsCRP 55 Echocardiography 55 FDG PET imaging 55 ADCS CGIC 55 Rheos System 55 sonographic diagnosis 55 tracheal intubation 55 cold pressor test 55 dissolving clots 55 computed tomography CT scans 55 computed tomography CT scan 55 Logistic regression analysis 55 guaiac 54 florbetaben 54 thyroid stimulating hormone 54 FDG PET 54 foam sclerotherapy 54 X ray angiography 54 catheter ablations 54 cardiac computed tomography 54 endocrinologic 54 microcalcifications 54 #F FDG 54 spiral CT scan 54 Secondary efficacy endpoints 54 nonfasting 54 multiple logistic regression 54 malignant polyps 54 enhanced MR angiography 54 fluoroscopically guided 54 needle aspiration 54 gross hematuria 54 barium enemas 54 electroencephalography EEG 54 glomerular filtration 54 HoLEP 54 Coronary angioplasty 54 orthostatic 54 atherosclerotic disease 54 ECG waveform 54 intensive statin therapy 54 diffusion MRI 54 psychophysiological 54 etiologic 54 LipiScan 54 LV dysfunction 54 interobserver reliability 54 intravascular ultrasound IVUS 54 acetabular fractures 54 electrocardiographic ECG 54 quantitative gene expression 54 thyroid nodules 54 electrocardiographs 54 gauge vitrectomy 54 endoscopic retrograde cholangiopancreatography ERCGrant Parpan 54 preimplantation 54 sonographically guided 54 fluoroscopic 54 carotid atherosclerosis 54 preoperative MRI 54 meta regression 54 cardiac magnetic resonance 54 fluorodeoxyglucose positron emission tomography 54 coblation 54 urodynamic 54 MRgFUS 54 Coronary artery bypass 54 glycosylated hemoglobin HbA1c 54 colorectal adenoma 54 Electrophysiological 54 myocardial ischemia 54 carotid artery stenting 54 electromyography 54 intracerebral haemorrhage 54 NIHSS 54 Cardioscan 54 immunochemical fecal occult 54 presurgical 54 laparoscopic fundoplication 54 microsatellite instability 54 immunohistochemical analysis 54 evoked potentials 54 hemoglobin hematocrit 54 colonoscopy sigmoidoscopy 54 ultrasound elastography 54 Angiogram 54 pCLE 54 pathologic fractures 54 paricalcitol 54 NYHA functional class 54 mitral annular 54 erythrocyte sedimentation rate 54 tomography imaging 54 Zargis Cardioscan 54 malignant nodules 54 myocardial revascularization 54 transrectal 54 invasive biopsy 54 liver biopsies 54 endoscopic ultrasound 54 scintigraphy 54 Computed tomography CT 54 fetal echocardiography 54 coronary calcification 54 refractive correction 54 cardioplegic arrest 54 audiogram 54 CT angiography CTA 54 aortic regurgitation 54 bronchoalveolar lavage 54 Optical coherence tomography 54 serologic 54 vascular anatomy 54 Charcot foot 54 Flexible sigmoidoscopy 54 Thrombolysis 54 PIB PET 54 painless noninvasive 54 thrombophilia 54 ASCUS 54 audiometer 54 morphologic characteristics 54 corneal topography 54 nasal endoscopy 54 adenoma detection 54 postoperative complication 54 hyperinsulinemic euglycemic clamp 54 deCODE BreastCancer TM 54 PET CT scan 54 fluorescent microscope 54 gadolinium enhanced 54 FDG uptake 54 Polysomnography 54 multivariable Cox 54 prognostic indicators 54 Hypertrophy 54 PET CT scans 54 Vasotrac 54 electrocardiograms 54 pretargeting 54 endoscopic sinus surgery 54 extracorporeal shock wave 54 carotid artery intima media 54 shock wave lithotripsy 54 preoperative staging 54 surgical biopsy 54 brain glucose metabolism 54 arterial stiffening 54 Endothelial function 54 intraventricular 54 logistic regression analysis 54 IGRAs 54 Pulse oximetry 54 sonographic appearance 54 x ray angiography 54 electroencephalography 54 medically inoperable 53 Sodickson 53 waist circumference WC 53 aberrometer 53 biopsy specimen 53 antiangiogenic therapy 53 Tonometry 53 preoperative PSA 53 left ventricular diastolic 53 VerifyNow 53 diagnostically 53 SLN biopsy 53 planum temporale 53 T wave alternans 53 urine albumin 53 laparoscopic cholecystectomy 53 PET CT fusion 53 AlloMap testing 53 Mammographic 53 computed tomographic scan 53 sEMG 53 ICD implantation 53 Fluorescein 53 histopathologic findings 53 preoperative evaluation 53 dimensional echocardiography 53 sputum induction 53 fluorescein angiography 53 noninvasive outpatient 53 Radiographic 53 RF ablation 53 Fecal occult blood 53 postoperative AF 53 metastatic lymph nodes 53 cytological 53 DEXA 53 lipoprotein levels 53 chronic airway obstruction 53 Myocardial perfusion imaging 53 nuchal fold 53 glycated hemoglobin HbA1c 53 SpCO 53 pupil dilation 53 diagnose Alzheimer disease 53 antihypertensive therapy 53 EEG recordings 53 DLQI 53 saline infusion 53 aortic annulus 53 neurophysiologic 53 histological examination 53 dermoscopy 53 dimensional computed tomography 53 serum PSA 53 Diffusion weighted 53 prime fibrinogen 53 posterior lumbar interbody fusion 53 polysomnographic 53 ConclusionThis 53 Reynolds Risk Score 53 multivariate analyzes 53 Optical Coherence Tomography 53 PSA nadir 53 cervical cytology 53 immunohistochemistry IHC 53 tomographic images 53 OPCAB 53 Surgical excision 53 surgically induced 53 chi squared 53 sputum cytology 53 mediastinoscopy 53 Intraocular pressure 53 Edinburgh Postnatal Depression 53 focal ablation 53 ALA PDT 53 ductal carcinomas 53 intracranial stenosis 53 T1 weighted images 53 maternal serum 53 nerve conduction velocity NCV 53 multidetector computed tomography MDCT 53 preoperatively 53 chest x ray 53 chemosensitivity 53 recombinant tissue plasminogen 53 neurological exam 53 Sentinel Lymph Node Biopsy 53 temporal arteritis 53 arterial stenosis 53 colonoscopy flexible sigmoidoscopy 53 quantitative EEG 53 Lymph node 53 creatinine levels 53 video assisted thoracoscopic 53 prostatic fluid 53 pathologic examination 53 optical coherence tomography OCT 53 extracranial 53 clinically insignificant 53 rate variability HRV 53 specific antigen PSA 53 extracorporeal circulation 53 neuropsychological testing 53 quantitative coronary angiography 53 radiographic 53 PLAC test 53 acute aortic dissection 53 cardiac biomarkers 53 Radical prostatectomy 53 Mantel Haenszel 53 amyloid deposition 53 fine needle aspiration 53 echocardiogram 53 carotid 53 x ray mammography 53 computed tomography CT angiography 53 pulmonary artery banding 53 fetal fibronectin 53 bullous 53 differentiate squamous 53 multidetector computed tomography 53 autonomic dysfunction 53 Subgroup analyzes 53 peri procedural 53 echocardiograph 53 direct laryngoscopy 53 Flow cytometry 53 serum ferritin 53 PET positron emission tomography 53 central corneal thickness 53 Electron beam 53 laryngoscopy 53 hemodilution 53 Coronary calcium 53 retest reliability 53 tonometer 53 Angiograms 53 Prostate specific antigen 53 Epley maneuver 53 WOMAC pain 53 upper GI endoscopy 53 cardiac catherization 53 doppler 53 nonfasting triglyceride levels 53 neurosensory 53 Balloon sinuplasty 53 vertebrobasilar 53 endobronchial 53 morphometry 53 decompressive surgery 53 diagnose coronary artery 53 transcranial magnetic stimulation 53 EarlyCDT Lung 53 Dr. Gurbel 53 spirometry testing 53 extracolonic findings 53 electrocardiography ECG 53 hemoglobin A1C 53 cTnT 53 CHADS2 53 Prostate Specific Antigen 53 denervation 53 cerebral perfusion 53 noninvasive painless 53 multivessel disease 53 MR angiography 53 atrial fibrillation ablation 53 pathologic correlation 53 carotid plaque 53 Neuropsychological Status 53 appendiceal 53 Endothelial dysfunction 53 laser photocoagulation 53 ovarian malignancy 53 urolithiasis 53 magnetoencephalography 53 specific antigen 53 nodal metastasis 53 Intravascular Ultrasound IVUS 53 serum phosphorous 53 cerebral arteries 53 endoscopic biopsy 53 serum cortisol 52 intravenous tPA 52 diffusion tensor 52 pulmonary artery pressure 52 ultrasound 52 Noninvasive 52 fetal aneuploidy 52 uninterrupted chest compressions 52 Cardiopulmonary bypass 52 chemoradiotherapy 52 AF ablation 52 Logistic regression 52 pars plana vitrectomy 52 aortic stiffness 52 silent ischemia 52 precancer 52 Preoperative 52 ischemic lesions 52 Fractional Flow Reserve 52 colorectal neoplasms 52 logistic regression models 52 peak VO2 52 Interrater reliability 52 PAP smears 52 arterial stiffness 52 Atherosclerotic 52 EKG electrocardiogram 52 EEG abnormalities 52 subthreshold depression 52 fundoplication 52 CT computerized tomography 52 stent graft placement 52 echocardiograms 52 fFN 52 computed tomography SPECT 52 multivariable analysis 52 chest x rays 52 HeartNet 52 NMES 52 noninvasive 52 cortical activation 52 hemodynamic parameters 52 oculomotor 52 blood oxygenation 52 abdominal CT scan 52 B7 H3 52 prostate cancer PCa 52 anatomic structures 52 palpation 52 EBUS FNA 52 mineral density BMD 52 Electroencephalography EEG 52 Tasigna prolongs 52 photon laser 52 thyroid stimulating hormone TSH 52 Logistic regression analyzes 52 cerebral angiography 52 alveolar bone loss 52 dose ionizing radiation 52 MDCT scans 52 Cotinine 52 arterial oxygen saturation 52 spectral Doppler 52 thrombus aspiration 52 imaging MRI 52 defibrillator implant 52 Optomap 52 stereotactic radiotherapy 52 noninvasive diagnostic 52 electroencephalograms EEG 52 interobserver 52 NMP# assay 52 choroidal vasculopathy 52 surrogate marker 52 QuantiFERON TB Gold 52 β blockers 52 multiplanar reconstruction 52 sputum specimens 52 Holter monitor 52 Ejection Fraction 52 hypervascular tumors 52 bioelectrical impedance 52 fetal ultrasound 52 SPECT CT imaging 52 calcified plaques 52 serum bilirubin 52 Oncotype 52 Framingham Risk Score 52 tamponade 52 endovascular therapy 52 FreeStyle Navigator 52 PSA kinetics 52 colon capsule endoscopy 52 preoperative diagnosis 52 intra arterial 52 axillary dissection 52 sensitivity specificity 52 radionuclide imaging 52 #F FDG PET 52 fMRI scanning 52 axial length 52 Visual Analog 52 vascular ultrasound 52 EtCO2 52 PressureWire 52 photoacoustic 52 leiomyomas 52 myocardial necrosis 52 neuromuscular electrical stimulation 52 mediated dilation 52 Cognitive therapy 52 primary hyperparathyroidism 52 hepatic arterial 52 bone scintigraphy 52 nonischemic 52 microcirculatory 52 Balloon angioplasty 52 multivariate Cox 52 Coronary artery bypass grafting 52 prostate cancer CaP 52 undergo prostate biopsy 52 pharmacodynamic effects 52 peritumoral 52 brain perfusion scans 52 computed tomography scanning 52 opacification 52 colon rectal 52 thyrotropin levels 52 TRUS 52 endoscopic examinations 52 parathyroidectomy 52 Vlachopoulos 52 Carotid artery stenting 52 isoflavone supplement 52 NSCLC tumors 52 hyperintense lesions 52 intestinal motility 52 immunofluorescent 52 Diffusion tensor imaging 52 pathologic diagnosis 52 anatomical landmarks 52 intracerebral 52 craniectomy 52 galvanic skin response 52 posttest 52 radiofrequency RF ablation 52 functional Magnetic Resonance 52 variance ANOVA 52 electrocardiograms ECGs 52 sonographically 52 uterine fibroid embolization 52 microalbumin 52 lung biopsy 52 microvascular dysfunction 52 Arterial stiffness 52 occlusive disease 52 RVOT 52 CARE HF 52 pump CABG 52 urinary cytology 52 adenoidectomy 52 CT colonography 52 Lp PLA2 52 palpate 52 DXA scans 52 liver resection 52 postop 52 Visualize Vascular 52 ejection fractions 52 conformal radiotherapy 52 computed tomography 52 Pulmonary artery 52 intensity modulated 52 fetal oxygen saturation 52 sonographic examination 52 thromboembolic disease 52 chronic thromboembolic pulmonary 52 diagnostic biomarker 52 Multidetector CT 52 intraobserver 52 Getzenberg 52 echocardiography 52 nerve conduction 52 neutrophil gelatinase associated lipocalin 52 salivary cortisol 52 upper gastrointestinal endoscopy 52 aortic root replacement 52 Sentinel node biopsy 52 urography 52 HRCT 52 Fasting glucose 52 elevated CRP 52 MR imaging 52 pacemaker implantation 52 exhaled nitric oxide eNO 52 histologic examination 52 neurophysiological 52 glucose sensor 52 otoscope 52 pelvic lymphadenectomy 52 neuro imaging 52 prostate abnormalities 52 prospectively randomized 52 diastolic pressures 52 lactate dehydrogenase LDH 52 MRI fMRI 52 cryptogenic stroke 52 estimated GFR 52 magnetic stimulation 52 diagnosing osteoporosis 52 vascular anomalies 52 postoperative atrial fibrillation 52 surface electromyography 52 Hemoglobin A1c 52 prognostic significance 52 impedance cardiography 52 cardiac angiography 52 RNFL 52 aminotransferases 52 sonographic examinations 52 proton MR spectroscopy 52 nondiabetics 52 ratio WHR 51 rectal palpation 51 thoracoscopic lobectomy 51 acute ischemia 51 dose helical CT 51 Quantitative EEG 51 bone erosions 51 tomography scans 51 Coronary Angiography 51 shockwave therapy 51 hematuria 51 Radiographs 51 lung nodules 51 d dimer 51 myocardial uptake 51 stenoses 51 surrogate markers 51 computed tomography angiography 51 adenotonsillectomy 51 dietary modification 51 risk stratification 51 coronary intervention 51 calculated creatinine clearance 51 Electromyography 51 Near infrared spectroscopy 51 ventilation perfusion 51 mitral stenosis 51 renal artery stenosis 51 subclinical hypothyroidism 51 esophageal reflux 51 brachial artery flow 51 Fine needle aspiration 51 intrathoracic impedance 51 parenchymal 51 atrial ablation 51 PESQ 51 Fine Needle Aspiration 51 barium enema 51 fMRIs 51 predictive validity 51 endometrial thickness 51 Fibromyalgia Impact Questionnaire 51 superior mesenteric artery 51 QRISK 51 peripheral arterial 51 pyridostigmine 51 C telopeptide 51 postoperative hemorrhage 51 anterior temporal 51 cortisol concentrations 51 PD2i 51 PITX2 methylation 51 brachial artery 51 arterial elasticity 51 fluoroscopy guided 51 interobserver agreement