Email Record: Guyton and Hall textbook of medical physiology [electronic resource] / John E. Hall, PhD, Arthur C. Guyton Professor and Chair, Department of Physiology and Biophysics, Director, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi, and Michael E. Hall, MD, MS, Associate Professor, Department of Medicine, Division of Cardiovascular Diseases, Associate Vice Chair for Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi.