1. Department of Clinical Sciences, General Practice, Lund University, Lund, Sweden;
2. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands;
3. Primary Care Research and Development Unit, Jönköping, Sweden;
4. Katholieke Universiteit Leuven, Academic Center for General Practice, Leuven, Belgium;
5. Department of Primary and Interdisciplinary Care (ELIZA), Center for General Practice, University of Antwerp, Antwerp, Belgium;
6. Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute (VAXINFECTIO), University of Antwerp, Antwerp, Belgium;
7. Department of Epidemiology and Social Medicine, University of Antwerp, Antwerp, Belgium