1. National Cancer Institute, NIH, Bethesda, MD, USA
2. Agencia Costarricense de Investigaciones Biomédicas (ACIB), Formerly Proyecto Epidemiológico Guanacaste, Fundación INCIENSA, San José, Costa Rica
3. HPV Immunology Laboratory, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, USA
4. Early Detection and Prevention Section, International Agency for Research on Cancer, Lyon, France
5. Cancer Genomics Research Laboratory, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research Inc., Frederick, MD, USA
6. Information Management Systems, Silver Spring, MD, USA
7. Independent Consultant, San José, Costa Rica