1. Oncology; Hospital de Clínicas de Porto Alegre; Porto Alegre Brazil
2. Postgraduation Program in Pathology; Federal University of Health Sciences; Porto Alegre Brazil
3. The Evidence-Based Medicine Consultancy Ltd; Bath UK
4. Social Medicine/Epidemiology; Post-graduation Program in Medical Sciences, Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
5. Medical School; Universidade do Extremo Sul Catarinense; Criciuma Brazil
6. Pathology; Faculty of Medicine at Federal University of Rio Grande do Sul; Rio Grande do Sul Brazil
7. Department of Public Health; Universidade Federal de Ciências da Saúde; Porto Alegre Brazil
8. Cancer Prevention Centre; Complexo Hospitalar Santa Casa; Rio Grande do Sul Brazil
9. Postgraduate Program in Epidemiology; Federal University of Rio Grande do Sul; Rio Grande do Sul Brazil
10. Oncology Unit; Hospital Moinhos de Vento; Porto Alegre Brazil
11. Cochrane Gynaecological, Neuro-oncology and Orphan Cancer Group; Royal United Hospital; Bath UK