Received: 20 June 2018
Accepted: 13 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: All procedures were approved by the Ethics Committee of First Hospital of Jilin University. Permission was obtained to access the data of First Hospital of Jilin University.
: The data do not contain any information that could identify the patient. A copy of the written consent is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.