Ma, Su-Li
Zhang, Lei
Article History
Received: 5 July 2018
Accepted: 21 February 2019
First Online: 19 March 2019
Ethics approval and consent to participate
: This study was approved by the ethical committee of Pudong New District People’s Hospital, Shanghai University of Medicine & Health Sciences. This is a retrospective and non-interventional study, so there was need for written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.