Article History
Received: 18 March 2019
Accepted: 6 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The Ethical Committee of Sir Run Run Shaw Hospital, Zhejiang University School of Medicine gave approval for this study. All patients provided written informed consent for their information to be stored in the hospital database and used for study.
: Not applicable.
: The authors declare that they have no competing interests. We confirm that we have read the Journal’s position on issues involved in ethical publication and affirm that this reports is consistent with those guidelines.