1. Department of Urology, Faculty of Medicine, Universitas Airlangga – Dr. Soetomo General Academic Hospital, Surabaya, Indonesia
2. Division of Nephrology, Department of Internal Medicine, University Medical Center Groningen, Groningen, Netherlands
3. Department of Health Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
4. Deapartment of Health Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands