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. Social Medicine/Epidemiology; Post-graduation Program in Medical Sciences, Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
4. Pathology; Faculty of Medicine at Federal University of Rio Grande do Sul; Rio Grande do Sul Brazil
5. Division of Hematology and Oncology; Lombardi Comprehensive Cancer Center; Washington DC USA
6. Department of Public Health; Universidade Federal de Ciências da Saúde; Porto Alegre Brazil
7. Oncology Unit; Hospital Moinhos de Vento; Porto Alegre Brazil
8. Cochrane Gynaecological, Neuro-oncology and Orphan Cancer Group; Royal United Hospital; Bath UK