1. Department of Health; Feira de Santana State University; Bahia Brazil
2. Department of Preventive Dentistry; Federal University of Bahia; Salvador Bahia Brazil
3. Department of Epidemiology; Federal University of Recôncavo of Bahia; Santo Antônio de Jesus Bahia Brazil
4. Department of Epidemiology; Health Sciences Institute; Federal University of Bahia; Bahia Brazil
5. School of Dentistry; The University of Queensland; Brisbane Australia