title: Observational research, randomised trials, and two views of medical science.
authors.affiliation: Royal Netherlands Academy of Arts and Sciences, and Department of Clinical Epidemiology, Leiden University Medical Centre, Leiden, The Netherlands. j.p.vandenbroucke@lumc.nl
authors.forename: Jan P
authors.initials: JP
authors.lastname: Vandenbroucke
mesh_terms: D035843:Biomedical Research / Q000379:methods* / Q000592:standards; D016022:Case-Control Studies; D003276:Contraceptives, Oral / Q000009:adverse effects; D005069:Evaluation Studies as Topic; D005165:Factor V / Q000235:genetics; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D011446:Prospective Studies; D016032:Randomized Controlled Trials as Topic / Q000592:standards; D012189:Retrospective Studies; D054556:Venous Thromboembolism / Q000235:genetics
chemical_list: D003276:Contraceptives, Oral; C095381:factor V Leiden; D005165:Factor V