1. Department of Social Medicine, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
2. Facultad de Ciencias Médicas, Cátedra de Pediatría, Universidad Central del Ecuador, Quito, Ecuador
3. Department of Internal Medicine, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, Brazil