1. Department of Pediatrics, Health Sciences Postgraduate Program, School of Medicine Federal University of Minas Gerais (UFMG) Belo Horizonte Brazil
2. Department of Statistics Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
3. Health Science/Primary Care Postgraduate Program State University of Montes Claros (Unimontes) Montes Claros Minas Gerais Brazil
4. Department of Pediatrics, Rady Children's Hospital University of California, San Diego La Jolla California USA
5. Health Science/Postgraduate Program in Nursing, School of Nursing Federal University of Minas Gerais (UFMG) Belo Horizonte Minas Gerais Brazil