1. Diabetes and Adrenal Unit, Department of Medicine–-First Division, Hospital das Clinicas, and Department of Radiobiology, U.S.A.
2. Instituto de Energia Atômica and Radioisotope Section of the Hospital do Servidor Público Estadual, São Paulo, Brazil, U.S.A.
3. Laboratory of Theoretical Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, U.S.A.