J. F. ETTER ;
T. PERNEGER
|
2001
Dans International Journal of Epidemiology (Vol.30, n°3, June 2001) Article : Périodique
Dans International Journal of Epidemiology (Vol.30, n°3, June 2001) Article : Périodique
Objectives: To compare smokers recruited by mail or through the Internet.
Methods: A questionnaire was mailed to 19 352 inhabitants of Switzerland in 1998, in an effort to enrol them in a smoking cessation trial. The same questionnaire was also[...]
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