1. Private Practice, Lima, Peru
2. Faculty of Human Medicine Department, Cayetano Heredia University, Lima, Peru
3. Faculty of Human Medicine Department, Universidad Autónoma de México, Mexico City, Mexico
4. Private Practice, Merida Yucatán, Mexico
5. Private Practice, Buenos Aires, Argentina
6. Faculty of Human Medicine Department, Lutheran University, Rio Grande do Sul, Brazil, Brazil
7. Faculty of Human Medicine Department, Franciscan University, Santa Maria, Rio Grande do Sul, Brazil.