aSection of Nephrology and Hypertension, 1st Department of Medicine, AHEPA Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece

bDivision of Nephrology, Department of Medicine, Indiana University School of Medicine and Richard L. Roudebush Veterans Administration Medical Center, Indianapolis, Indiana, USA

Correspondence to Professor Rajiv Agarwal, MD, MS, FASH, FAHA, FASN, Division of Nephrology, Department of Medicine, Indiana University School of Medicine and Richard L. Roudebush Veterans Administration Medical Center, 1481 West 10th Street, Indianapolis, IN 46202 USA. Tel: +1 317-988-2241; fax: +1 317-988-5098; e-mail: [email protected]