Received: 19 July 2018
Accepted: 6 June 2019
First Online: 20 June 2019
Ethics approval and consent to participate
: This study was in adherence with the Declaration of Helsinki and was approved by the ethics committee of Peking University First Hospital (approval number 2017). All these patients gave written informed consent before data collection.
: Not applicable.
: The authors declare that they have no competing interests.