Received: 20 June 2019
Accepted: 24 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: This research was approved by the Third Hospital Affiliated of Qiqihar Medical University and conducted in accordance with the principles of the Declaration of Helsinki (Number: THP-2018-B-002013).
: Not applicable.
: The authors declare that they have no competing interests.