Affiliation: | 1.The Research Unit for General Practice and Section of General Practice, Department of Public Health, University of Copenhagen, ?ster Farimagsgade 5, P.O. Boks 2099, 1014, K?benhavn K, Denmark ;2.National Institute of Public Health, University of Southern Denmark, Studiestr?de 6, 1455, K?benhavn K, Denmark ; |