1. Division of Renal Medicine and Baxter Novum, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Karolinska Universitetssjukhuset Huddinge, Stockholm, Stockholm, Sweden
2. Department of Internal Medicine, School of Medical Sciences, Örebro University, Södra Grev Rosengatan, Örebro, Örebro, Sweden
3. Milano Biccoca University, Milan, Italy
4. Department of Medical Epidemiology and Biostatistics (MEB), Karolinska Institutet, Nobels väg 12A, Stockholm, Sweden
5. Department of Medicine, Karolinska Institutet, Karolinska Universitetssjukhuset, Solna, Stockholm, Stockholm, Sweden
6. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, W6508, Baltimore, MD, USA