1. Division of Hypothalamic Research and Division of Endocrinology and Metabolism, Department of Internal Medicine and Department of Psychiatry; University of Texas Southwestern Medical Center; Dallas Texas 75390-9077
2. Laboratory of Electrophysiology; Multidisciplinary Institute of Cell Biology; CP 1900 Buenos Aires Argentina
3. Laboratory of Neurophysiology; Multidisciplinary Institute of Cell Biology; CP 1900 Buenos Aires Argentina
4. Department of Physiology, Faculty of Medicine; Monash University; Melbourne 3800 Victoria Australia