LAUSR

In the article, “Efficacy and safety of PDE5 inhibitors in the treatment of diabetes mellitus erectile dysfunction: Protocol for a systematic review”, which appeared in Volume 97, Issue 40 of Medicine, the footnote should read: XL, QZ, JSW, JSW and HHD contributed equally to this work and are co-first authors. Dr. Jingshang Wang should be affiliated with both affiliations a and b. The corresponding author information should appear as: Bin Wang, Haisong Li, Department of Andrology, Dongzhimen Hospital, Dongcheng District, Hai Yun Cang on the 5th Zip, Beijing 100029, China (e-mails: [email protected], [email protected]).