Article History
Received: 4 August 2019
Accepted: 21 January 2020
First Online: 5 February 2020
Ethics approval and consent to participate
: The Ethics Committee of the Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, China, approved of the study protocol. All subjects signed informed consent documents prior to enrollment.
: Not applicable.
: The authors declare that they have no competing interests.