aThe Jared Grantham Kidney Institute

bDepartment of Internal Medicine, Division of Nephrology & Hypertension, University of Kansas Medical Center, Kansas City, Kansas 66160, USA

Correspondence to Jason R. Stubbs, MD, University of Kansas Medical Center, Division of Nephrology & Hypertension, 3901 Rainbow Blvd, Mail Stop 3018, Kansas City, Kansas 66160, USA. Tel: +913 588 5022; fax: +913 588 3867; e-mail: [email protected]