Philip E Castle1, Emily A Burger2. 1. Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Global Coalition Against Cervical Cancer, Arlington, VA, USA. Electronic address: castle.philip@gmail.com. 2. Center for Health Decision Science, Harvard T H Chan School of Public Health, Harvard University, Boston, MA, USA; Department of Health Management and Health Economics, Institute of Health and Society, University of Oslo, Norway.