Cui, Yanping
Guan, Shan
Ding, Jie
He, Yukai
Li, Qingfang
Wang, Sikui
Sun, Huiling
Article History
Received: 27 February 2017
Accepted: 30 October 2018
First Online: 15 November 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the ethics committee of the Peoples’ Hospital of Liaocheng City.
: Due to the retrospective and anonymized design of the study, written consent from the participants was deemed not to be required.