1.
Bergk V, Gasse C, Schnell R, Haefeli W. Mail surveys: Obsolescent model or valuable instrument in general practice research?. Swiss Med Wkly [Internet]. 2005 Apr. 9 [cited 2024 Apr. 30];135(1314):189-. Available from: https://smw.ch/index.php/smw/article/view/478