1. Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases; Department of Nephrology; Beijing China 100853
2. Mario Negri Institute for Pharmacological Research; Department of Renal Medicine, Laboratory of Biostatistics, Clinical Research Center for Rare Diseases "Aldo e Cele Daccò"; Ranica (Bergamo) Italy 24020
3. Azienda Ospedaliera "Ospedali Riuniti di Bergamo"; Unit of Nephrology; Mario Negri Institute for Pharmacological Research Via Gavazzeni, 11 Bergamo Italy 24125
4. Ramon y Cajal Institute for Health Research (IRYCIS), CIBER Epidemiology and Public Health (CIBERESP) and Cochrane Collaborating Centre; Clinical Biostatistics Unit; Ctra. Colmenar km 9,100 Madrid Madrid Spain 28034
5. CIBER Epidemiologia y Salud Publica (CIBERESP); Madrid Spain
6. MediClin Müritz-Klinikum Waren; Department of Internal Medicine; Weinbergstrasse 19 Waren/Müritz Germany 17192
7. Mueritz-Klinik; Renal Services; Klink Germany