title: Who needs selection bias?
authors.affiliation: Department of Public Health Aarhus University, Bartholins Allé 2, DK-8000 Aarhus, Denmark. jo@soci.au.dk.
authors.forename: Jørn
authors.initials: J
authors.lastname: Olsen
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D008019:Life Style; D015983:Selection Bias