1. Postraduate Program in EndocrinologyUniversidade Federal do Rio Grande do Sul Porto Alegre Brazil
2. National Institute of Science and Technology for Health Technology AssessmentHospital de Clínicas de Porto Alegre Porto Alegre Brazil
3. Department of EpidemiologyJohns Hopkins and Bloomberg School of Public Health Baltimore Maryland
4. Instituto de Estudos em Saúde ColetivaUniversidade Federal do Rio de Janeiro Rio de Janeiro Brazil
5. Endocrine DivisionHospital de Clínicas de Porto Alegre Porto Alegre Brazil