title: Introduction: seeing the forest and the trees--from observation to experiments in social epidemiology.
authors.affiliation: Department of Society, Human Development, and Health, Harvard School of Public Health, Boston, MA 02115, USA. lberkman@hsph.harvard.edu
authors.forename: Lisa F
authors.initials: LF
authors.lastname: Berkman
mesh_terms: D006291:Health Policy; D006801:Humans; D011634:Public Health / Q000191:economics / Q000941:ethics; D011635:Public Health Administration; D016032:Randomized Controlled Trials as Topic / Q000592:standards* / Q000706:statistics & numerical data; D012923:Social Class; D012959:Socioeconomic Factors