Carpenter RJ, Refugio ON, Adams N, O'Brien KP, Johnson MD, Groff HL, Maves RC, Bavaro MF, Crum-Cianflone NF. Prevalence and factors associated with asymptomatic gonococcal and chlamydial infection among US Navy and Marine Corps men infected with the HIV: a cohort study. BMJ Open. 2013 May 28; 3(5).