title: Experiment and observation.
authors.affiliation: Department of Family Medicine, University Center for Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: J
authors.initials: J
authors.lastname: Herman
mesh_terms: D016022:Case-Control Studies; D002986:Clinical Trials as Topic; D006801:Humans; D010686:Philosophy, Medical; D012106:Research; D012107:Research Design