Prevalence and Reasons for the Absence of Vaginal Intercourse in Chinese Middle-Aged and Elderly Men by Yi Lu, MD, Jianzhong Zhang, MD, Chengquan Ma, MD, Hao Su, MD, Hongjun Li, MD

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Assessment on Occurrences of Depression and Anxiety and Associated Risk Factors in the Infertile Chinese Men by Bin Yang MD, Jianchao Zhang MM, Yuxia Qi BS, Pu Wang MM, Ronghuan Jiang MD, Hongjun Li MD

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Effects of Two Different Dosages of Sildenafil on Patients With Erectile Dysfunction by Hongjun Li MD, Gang Bai MD, Xinyu Zhang MD, Bingbing Shi MD, Defeng Liu MD, Hui Jiang MD, Zhigang Ji MD, Matthew R. Davis BS, Ziwen Zhu BS, Yujiang Fang MD, PhD

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