Related by context. Frequent words. (Click for all words.) 57 randomly assigned 53 randomly assign 49 randomized 47 randomized controlled trial 47 multicenter study 46 randomized controlled 46 blinded placebo controlled 45 randomized clinical 44 randomize 43 randomisation 43 retrospective cohort study 43 randomized #:# 42 Clinical trials 42 multicenter 42 generalizability 42 enrolling 42 study 42 longitudinal study 42 clinical trial 41 prospective cohort 41 antidepressant therapy 41 researchers 41 observational study 41 Phase IIb trial 40 brain scans 40 Professionals Follow 40 inactive placebo 39 biostatistician 39 neuropsychological tests 38 generalizable 38 Researchers 38 cognitively normal 37 HCV infected 37 genotyped 37 rhesus monkeys 37 National Longitudinal Survey 37 experimentally 37 screening colonoscopy 37 NNRTI 37 Phase III randomized 37 gene expression profiles 37 electrodes implanted 36 randomly chosen 36 laboratory experiments 36 studies 36 mitral valve repair 36 implanting 36 n = 36 Hospital BWH 36 longitudinal studies 36 cohort 36 phase IIa 36 implantations 36 imaging fMRI 35 randomly selected 35 Epidemiological studies 35 cheek swabs 35 Medical Expenditure Panel 35 catheterization 35 genetic markers 35 ANOVA 35 Clinical Psychiatry 35 Biopsies 35 evaluating 35 random sample 35 experiment 34 Phase IIa trial 34 gene expression patterns 34 enroll 34 pretest 34 experimenters 34 experimental 34 enrolled 34 logistic regression 34 Brain scans 34 unselected 34 corneal transplants 34 treating 34 evaluable 34 trials 33 saliva samples 33 subsample 33 computational methods 33 Phase Ia 33 experiments 33 Neuroimaging 33 postdoctoral research 33 Health HSPH 33 journal Stroke 33 Interview Survey 33 electrodes attached 33 evaluated 33 Phase 2a trial 33 Cohort Study 33 Brain Imaging 33 fecal samples 32 neurobiologists 32 microelectrodes 32 biopsies 32 transplantations 32 interviewing