Text and Data Mining valid from 2019-03-09
Received: 9 August 2018
Revised: 30 January 2019
Accepted: 4 February 2019
First Online: 9 March 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This study was approved by the Review Committee of Anhui Medical University. The Approval number of the Ethical clearance is 2019H003.