title: Unexpected effects of a prior feedback letter and a professional layout on the response rate to a mail survey in Geneva.
authors.affiliation: Institute of Social and Preventive Medicine, University of Geneva, Switzerland.
authors.forename: J F
authors.initials: JF
authors.lastname: Etter
authors.forename: T V
authors.initials: TV
authors.lastname: Perneger
authors.forename: J D
authors.initials: JD
authors.lastname: Laporte
mesh_terms: D000328:Adult; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D010358:Patient Participation; D011795:Surveys and Questionnaires; D013557:Switzerland