James Young (Author) Mail surveys of general practice physicians: response rates and non-response bias Fulltext PDF
V Bergk, C Gasse, R Schnell, WE Haefeli (Author) Mail surveys: Obsolescent model or valuable instrument in general practice research? Fulltext PDF
E Chamot, Gallacdhi Bouvier (Author) Swiss primary care physicians reporting of utility and use of recommended vaccinations for adults Fulltext PDF
