aHarold Simmons Center for Kidney Disease Research and Epidemiology, Division of Nephrology, Hypertension and Kidney Transplantation, Department of Medicine, University of California Irvine School of Medicine, Orange

bNephrology Section, Department of Medicine, Tibor Rubin Veterans Affairs Medical Center, Veterans Affairs Long Beach Healthcare System, Long Beach

cMulti-Organ Transplant Center, Section of Nephrology, Department of Internal Medicine, William Beaumont Hospital, Oakland University William Beaumont School of Medicine, Royal Oak, Michigan

dLundquist Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California, USA

Correspondence to Ekamol Tantisattamo, MD, MPH, Associate Clinical Professor of Medicine, Harold Simmons Center for Kidney Disease Research and Epidemiology, Division of Nephrology, Hypertension and Kidney Transplantation, Department of Medicine, University of California Irvine School of Medicine, 101 The City Drive South, Orange, CA 92868, USA. Tel: +1 714 456 5142; fax: +1 714 456 6034; e-mail: [email protected]