1 Department of Medicine & Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Sha Tin, New Territories, Hong Kong, China. Electronic address: fws898@ha.org.hk.
2 Department of Public and Global Health, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland; Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA; Department of Paediatrics and Child Health, University of Cape Town, Cape Town, South Africa. Electronic address: valerie.luyckx@uzh.ch.
3 Providence Medical Research Center, Providence Inland Northwest Health, Spokane, Washington, USA; Nephrology Division, Department of Medicine, University of Washington, Seattle, Washington, USA. Electronic address: katherine.tuttle@providence.org.