1. School of Medicine; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
2. Service of Gynecology and Obstetrics; Hospital de Clínicas de Porto Alegre; Porto Alegre Brazil
3. Unit of Biostatics; Hospital de Clínicas de Porto Alegre; Porto Alegre Brazil
4. Service of Endocrinology and Metabology; Hospital de Clínicas de Porto Alegre; Porto Alegre Brazil