Hu, Yanyan https://orcid.org/0000-0001-6444-8961
Man, Yulin https://orcid.org/0000-0002-4231-5639
Sun, Xuemei https://orcid.org/0000-0003-3532-7292
Xue, Yongzhen https://orcid.org/0000-0003-3495-6732
Article History
Received: 31 October 2020
Accepted: 18 February 2021
First Online: 2 March 2021
Ethics approval and consent to participate
: The study was approved by the institutional review board of was approved by Linyi People’s Hospital.
: Not applicable.
: The authors declare that they have no competing interests.