Li, Ying
Liu, Xuewei
Li, Guangsen
Zhang, Ping
Article History
Received: 5 September 2019
Accepted: 13 April 2020
First Online: 18 May 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All the subjects submitted written informed consent after in detail understanding the study protocol and possible risks. The design proposal, methods of material collection, and data analysis were consistent with the declaration of Helsinki and were approved by the Ethics Committee of The Second Affiliated Hospital of Dalian Medical University (Dalian, China; Approval number, KY2015-128).