1. Department of Nephrology; Clinic rechts der Isar; Technical University Munich; Munich; Germany
2. Department of Internal Medicine and Nephrology; Transplantation Center; Lower Saxony Center for Nephrology; Hann; Muenden; Germany
3. Department of Nephrology; Charité Campus Mitte; Charité Universitätsmedizin Berlin; Berlin; Germany
4. Department of Urology and Transplantation; Martin-Luther-University Halle; Halle/Saale; Germany
5. Department of Nephrology and Intensive Care; Charité Campus Virchow; Charité Universitätsmedizin Berlin; Berlin; Germany
6. Departamento de Transplantes; Instituto Mexicano del Seguro Social; Hospital de Especialidades 71; Torreon; Coahuila; Mexico
7. Medical Clinic I; Clinic of Cologne; Cologne; Germany
8. Department of Nephrology; Westpfalz Clinic Kaierslautern; Kaiserslautern; Germany
9. Department of Nephrology; Medical University Hannover; Hannover; Germany