Related by context. Frequent words. (Click for all words.) 53 scientifically valid 52 peer reviewed 50 scientifically 49 scientifically accurate 48 observational studies 48 NCCAM 48 peer reviewed literature 47 scientific rigor 46 peer reviewed publication 46 randomized controlled clinical trials 45 placebo controlled studies 45 randomized controlled trials 45 empirical 45 randomized clinical trials 45 study 44 meta analyzes 44 intellectually rigorous 44 virtual colonoscopy 44 subgroup analyzes 43 Systematic Reviews 43 randomized trials 43 studies 43 methodologically 43 psychotherapies 43 epidemiologic studies 43 peer reviewed journals 43 ClinicalTrials.gov 43 RCTs 43 meta analysis 42 scientific 42 longitudinal studies 42 clinically relevant 42 randomized clinical 42 rigorous 42 Cochrane Database 41 Cochrane Collaboration 41 statistically valid 41 observational study 41 PROPEL trial 41 placebo controlled trials 41 unscientific 41 retrospective cohort study 40 reanalysis 40 substudy 40 epidemiological studies 40 NBPTS 40 randomized controlled clinical 40 randomized controlled 40 authoritative 40 researchers 40 prospective observational 40 journal PLoS Medicine 40 generalizability 40 surrogate endpoints 40 randomized controlled trial 40 peer reviewed journal 39 unbiased 39 Health Initiative WHI 39 NEJM 39 multidisciplinary approach 39 Medicine NEJM 39 generalizable 39 empirically 39 journal Lancet 38 comprehensive 38 rigorously 38 efficacious 38 biostatistician 38 Medical Expenditure Panel 38 clinical trials 38 behavioral interventions 38 USPSTF 38 quantitative measurements 38 biologically plausible 37 subjective 37 journal Obesity 37 Council ESRC 37 nonscientific 37 observational 37 exercise biomechanics 37 dispassionate 37 Clinical Endocrinology & 37 chromium picolinate 37 pharmacokinetic studies 37 placebo controlled clinical 37 peer reviewed scientific 37 clinical trial 37 DNA barcoding 37 bmj.com 37 scientifically validated 37 IQWiG 37 genotoxicity 37 multicentre 37 multicenter 36 longitudinal study 36 Mathematica Policy Research 36 rational 36 learner centered 36 Endocrine Society 36 educationally sound 36 Interphone