1. Division of Nephrology; Department of Internal Medicine; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
2. Department of Medical Microbiology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
3. Division of Pathology; Department of Pathology and Medical Biology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
4. Department of Epidemiology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands