Zhang, Jiangang
Wang, Zhuhai
Hong, Ge
Article History
First Online: 6 January 2021
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The research plan has been submitted to the ethics committee of The Third Hospital of Hebei Medical University for approval. The committee issued a positive decision No. 2018-02 on August 31, 2018. The ethics committee of medical college is part of a large medical university in Shi Jiazhuang. The written informed consent for participation was obtained from the caregivers and relatives of all participants.
: Not applicable.