Article History
Received: 6 March 2020
Accepted: 16 June 2020
First Online: 7 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by Ethical Committee of The First Affiliated Hospital of Harbin Medical University and conducted in accordance with the ethical standards.
: All study subjects signed informed consent prior to their participation.