1. Postgraduate Program in Medical Sciences: Endocrinology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
2. Department of Neurosurgery, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
3. Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
4. Endocrinology Division, Hospital de Clínicas de Porto Alegre, UFRGS, Porto Alegre, Brazil