Received: 19 January 2020
Accepted: 28 April 2020
First Online: 2 June 2020
Ethics approval and consent to participate
: Ethical approval was not necessary because this study is a review of previous RCTs, and we did not obtain any other data from patients. The need for consent to participate is not applicable.
: Not applicable.
: The authors Linbo Peng, Yi Zeng, Yuangang Wu, Junfeng Zeng, Yuan Liu, and Bin Shen declare that they have no conflicts of interest.