1Division of Pediatric Nephrology and Hypertension, University of Texas, Houston, Medical School, 6431 Fannin Street, Room 3.124, Houston, TX 77030, USA e-mail: [email protected] Tel.: +1-713-5005677, Fax: +1-713-5005680, , US 2Wyeth-Ayerst Laboratories, Philadelphia, Pennsylvania, USA, , US
3Procter and Gamble Pharmaceuticals, Cincinnati, Ohio, USA, US
4B & B Clinical Innovations, Kansas City, Missouri, USA, , US
5Cleveland Clinic Foundation, Cleveland, Ohio, USA, , US