Chambers LC, Morgan JL, Lowens MS, Robinson TS, Romano SS, Leipertz GL, Hughes JP, Golden MR, Khosropour CM, Fredricks DN, Manhart LE. Cross-sectional study of urethral exposures at last sexual episode associated with non-gonococcal urethritis among STD clinic patients. Sex Transm Infect. 2019 05; 95(3):212-218.