Association of sexually transmitted infection with semen quality in men from couples with primary and secondary infertility oleh Shun Bai, Yuan Li, Mei-Hong Hu, Li Wu, Li-Jun Shui, Xiao-Han Wang, Yi-Xun Liu, Qiu-Ling Yue, Li-Na Yu, Kai-Qiang Fu, Xian-Hong Tong, Xue-Chun Hu, Bo Xu