Article History
Received: 29 April 2019
Accepted: 13 September 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Board Committee of The First people’s Hospital of Changzhou. The personal information and medical records of each patient were strictly protected. When the patients were admitted to the hospital, the doctor signed a treatment consent form with them and asked if they agreed to participate in our study. The signed documents were kept with the documentation of each patient. When they were discharged from hospital, the cases were filed, resulting in written consent not needed again. However, verbal informed consent was obtained from all participants in our study.
: Not applicable.
: The authors declare that they have no competing interests.