1. Department of Endocrinology and Metabolism, Cesar Milstein Hospital, Buenos Aires, Argentina.
2. Clinical Endocrinology Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland.
3. Department of Biochemistry, Buenos Aires University Medical School; Department of Radiobiology, National Commission of Atomic Energy (CNEA); Buenos Aires, Argentina.
4. Diabetes Section, Cardiovascular Institute of Buenos Aires, Buenos Aires, Argentina.
5. Department of Physiology, Buenos Aires University Medical School, Buenos Aires, Argentina.