Article History
Received: 2 April 2019
Revised: 30 August 2019
Accepted: 4 September 2019
First Online: 9 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest..
: The study was approved by the institutional review board of the Wannan Medical College.
: Informed consent was obtained from all individual participants included in the study.