[1] Radboud Univ Nijmegen, Sci Ctr Qual Healthcare IQ Healthcare, Radboud Inst Hlth Sci, Med Ctr, POB 9101, NL-6500 HB Nijmegen, Netherlands
[2] Univ Zurich, Inst Primary Care, Pestalozzistr 24, CH-8091 Zurich, Switzerland
[3] Univ Hosp Zurich, Pestalozzistr 24, CH-8091 Zurich, Switzerland
[4] Res Unit Gen Practice, Bartholins Alle 2, DK-8000 Aarhus, Denmark