Received: 29 July 2019
Accepted: 20 September 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The ethics committee met at the Shandong Provincial Qianfoshan Hospital, and review board approval to this study was obtained. Written consent was also received from patients.
: Written consent for publication was obtained from patients.
: The authors declare that they have no competing interest.