1. Department of Internal Medicine, section Nursing Science, Erasmus MC, Erasmus University Medical Center, Rotterdam, The Netherlands
2. Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
3. School of Health Sciences, University of Surrey, Guildford, UK
4. Department of Biostatistics, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
5. Department of Epidemiology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
6. Department of Surgery, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands