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