Received: 8 April 2020
Accepted: 15 June 2020
First Online: 25 June 2020
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: This research was approved by the Medical Ethics Committee of Linyi People’s Hospital and followed the Declaration of Helsinki. Written informed consent will be signed by every participant before data collection. All data in this study will be kept anonymous and managed with confidentially.