Received: 25 February 2020
Accepted: 12 June 2020
First Online: 18 June 2020
Ethics approval and consent to participate
: Ethics approval for this study was submitted and approved through Research Ethics Committee of the First Affiliated Hospital, College of Medicine, Zhejiang University. The consent to participate was waived by our institutional review board since this study was retrospective data collection. The patient information used in this study was anonymised before its use.
: Not applicable.
: The authors declare that they have no competing interests.