1. Roche Molecular Diagnostics, Pleasanton, CA
2. National Cancer Institute, National Institutes of Health, Bethesda, MD
3. HPV Immunology Laboratory, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD
4. Agencia Costarricense de Investigaciones Biomédicas (ACIB), formerly Proyecto Epidemiológico Guanacaste, Fundación INCIENSA, San José, Costa Rica
5. Prevention and Implementation Group, International Agency for Research on Cancer, Lyon, France
6. DDL, Diagnostic Laboratory, Rijswijk, the Netherlands
7. Information Management Systems, Silver Spring, MD
8. Independent Consultant, San José, Costa Rica