Clinical features and microsurgical reconstruction of congenital unilateral absence of the vas deferens with obstructive azoospermia: a tertiary care center experience oleh Yi-Hong Zhou, Jian-Jun Dong, Er-Lei Zhi, Chen-Cheng Yao, Yu-Hua Huang, Ru-Hui Tian, Hui-Xing Chen, Ying-Bo Dai, Yu-Xin Tang, Na-Chuan Liu, Hui-Rong Chen, Fu-Jun Zhao, Zheng Li, Peng Li