1. Department of Internal Medicine, Division of Nephrology, University Medical Centre Groningen, Groningen, The Netherlands
2. Department of Laboratory Medicine, University Medical Centre Groningen, Groningen, The Netherlands
3. Faculty of Economics and Business, University of Groningen, The Netherlands
4. Aletta Jacobs School of Public Health, University of Groningen, The Netherlands
5. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden