1. Human Papillomavirus Immunology Laboratory, Leidos Biomedical Research, Incorporated, Frederick National Laboratory for Cancer Research, Building 469, Room 111, 1050 Boyles Street, Frederick, MD 21702, USA
2. Department of Epidemiology, University of Iowa College of Public Health, 145 Riverside Drive, S471 CPHB, Iowa City, IA 52242, USA
3. Department of Epidemiology, University of Iowa College of Public Health, 145 Riverside Drive, S427 CPHB, Iowa City, IA 52242, USA