BERGK, V.; GASSE, C.; SCHNELL, R.; HAEFELI, W. Mail surveys: Obsolescent model or valuable instrument in general practice research?. Swiss Medical Weekly, [S. l.], v. 135, n. 1314, p. 189–189, 2005. DOI: 10.4414/smw.2005.10893. Disponível em: https://smw.ch/index.php/smw/article/view/478. Acesso em: 1 may. 2024.