1. Postgraduate Science and Health Program, Federal University of Piauí, Teresina, Piaui 64001-020, Brazil
2. Department of Dermatology, Federal University of Piaui, Teresina, Piaui 64049-550, Brazil
3. Departament of Gynecology, Federal University of Piauí, Teresina, Piaui 64049-550, Brazil
4. Departament of Statistics, Sao Paulo University, Sao Paulo 03178-200, Brazil