Text and Data Mining valid from 2019-01-08
Received: 31 March 2018
Accepted: 12 December 2018
First Online: 8 January 2019
: Dr. Pravesh Kumar Bundhun (M.D) is the first author. From the Department of Internal Medicine, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China.
: Ethical approval was not applicable for this systematic review and meta-analysis.
: 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.