Pan, Xiongfeng
Wang, Zhipeng
Wu, Xiaoli
Wen, Shi Wu
Liu, Aizhong
Article History
Received: 9 January 2018
Accepted: 25 September 2018
First Online: 5 October 2018
Ethics approval and consent to participate
: Ethical approval and participant consent were not applicable for this systematic review and meta-analysis, since this study involved data and materials from published articles.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.