1. Department of General Internal Medicine, Ghent University Hospital, Ghent, Belgium
2. Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
3. Department of Public Health, Ghent University, Ghent, Belgium
4. Department of Business Economics, Hasselt University, Diepenbeek, Belgium
5. Department of Internal Medicine, Ghent University, Ghent, Belgium
6. Department of Head, Neck and Maxillo-Facial Surgery, Ghent University Hospital, Ghent, Belgium