1. Endocrinology Service, Hospital de Pediatria Garrahan, Buenos Aires
2. Laboratory of Cellular Biology and Retrovirus, Hospital de Pediatria Garrahan
3. Endocrinology Service, Hospital de Niños Gutierrez, Buenos Aires
4. Endocrinology Service, Hospital de Niños SSM Ludovica, La Plata
5. Endocrinology Service, Hospital JM Ramos Mejía, Buenos Aires, Argentina