1. RM Lovering, PT, PhD, is Research Associate, Department of Physiology, University of Maryland, School of Medicine, 685 W Baltimore St, Baltimore, MD 21201 (USA) .
2. NC Porter, MD, is Assistant Professor, Department of Neurology, University of Maryland, School of Medicine
3. RJ Bloch, PhD, is Professor, Department of Physiology, University of Maryland, School of Medicine