Article History
Received: 14 October 2019
Accepted: 10 December 2019
First Online: 26 December 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Cangzhou Central Hospital, and followed the ethical guidelines laid down in the 1975 Declaration of Helsinki.
: Written informed consent was obtained from the patients next of kin for publication of their individual details in this manuscript. The consent form is held by the authors’ institution and is available for review by the Editor-in-Chief.
: The authors declare that they have no competing interests.