1. Department of Physiology, Los Andes University Medical School, Mérida, Venezuela.
2. Metabolism Center, Mérida, Venezuela.
3. Douglas Hospital Research Center, McGill University, Verdun, Quebec, Canada.
4. Department of Endocrinology, Los Andes University, Mérida, Venezuela.
5. Department of Psychiatry, Los Andes University, Mérida, Venezuela.