Dialysis Center Elsenfeld, Elsenfeld, Bavaria, Germany
University Hospital, Ghent, Belgium
University of Würzburg, Department of Medicine, Division of Nephrology, and Department of Dermatology, Wuerzburg, Bavaria, Germany
University of Göttingen, Department of Dermatology and Department of Nephrology and Rheumatology, Göttingen, Lower Saxony, Germany