Received: 29 January 2019
Accepted: 13 June 2019
First Online: 21 June 2019
Ethics approval and consent to participate
: This study was conducted according to the tenets of the Declaration of Helsinki. All of the patients signed informed consent forms, and the study protocol was approved by the ethics committee of the First People’s Hospital of Huzhou, Zhejiang Province, China.
: Not applicable.
: The authors declare that they have no competing interests.