title: Social networks research and challenges to causal inference.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Ellen
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D015984:Causality; D002648:Child; D015986:Confounding Factors, Epidemiologic; D006304:Health Status; D006801:Humans; D012106:Research; D012944:Social Support