1. Department of Cancer Epidemiology; Moffitt Cancer Center; Tampa; Florida
2. Robert E Fechner Laboratory of Surgical Pathology; University of Virginia Health System; Charlottesville; Virgina
3. Department of Epidemiology and Biostatistics; College of Public Health, University of South Florida; Tampa; Florida
4. Instituto Nacional de Salud Pública; Cuernavaca; México
5. Centro de Referencia e Treinamento em DST/AIDS; São Paulo; Brazil
6. Ludwig Institute for Cancer Research; São Paulo; Brazil