3 Division of Nephrology and KfH Renal Unit, Hospital St Georg, Leipzig, Germany; Department of Internal Medicine 2 (Nephrology, Rheumatology, Endocrinology), Martin-Luther University Halle, Wittenberg, Germany.
4 Steno Diabetes Center, Copenhagen, Denmark; Institute for Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
5 Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.