1. University Clinic for Nephrology and Hypertension, Diabetology and Endocrinology Otto‐von‐Guericke University Magdeburg Magdeburg Germany
2. Clinic of Orthopedics and Traumatology St. Elisabeth Hospital Mayern Mayen Germany
3. Clinic of Orthopedics and Traumatology Agaplesion Markus Hospital Frankfurt Germany
4. Department of Nephrology Hannover Medical School Hannover Germany