More Groups
Fewer Groups
More People
Fewer People
Flores, S.; Choi, J.; Alex, B.; Mulhall, J. P. Journal of Sexual Medicine (2011)
Dickler, M.; Morris, E.; Robson, M.; Choi, J.; Hummer, A.; Panageas, K.; Ballon, D.; Borgen, P.; Norton, L.; Hudis, C. Cancer Epidemiology Biomarkers and Prevention (2002)