Nephrology and fluid/electrolyte physiology / William Oh, MD, Professor of Pediatrics, Department of Pediatrics, Warren Altpert Medical School of Brown University, Staff Neonatologist, Department of Pediatrics, Women and Infants' Hospital, Providence, Rhode Island, Scientific Medical Director, Florida Hospital for Children, Orlando, Florida, Michel Baum, MD, Professor of Pediatrics and Internal Medicine, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas ; consulting editor, Richard A. Polin, MD, William T. Speck Professor of Pediatrics, College of Physicians and Surgeons, Columbia University, Director Division of Neonatology, New York Presbyterian, Morgan Stanley Children's Hospital, New York, New York.