Li, Li
Ma, Yi
Geng, Xue‑bin
Tan, Zheng
Wang, Jian‑hui
Cui, Chuan
Wang, Hong-ling
Shang, Xiao‑ming
Article History
Received: 8 March 2020
Accepted: 2 April 2020
First Online: 16 April 2020
Compliance with ethical standards
:
: The authors declare no funding sources or conflicts of interest.
: The study was approved by the Ethics Committee of the Tangshan Gongren Hospital and conducted in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Consents of participants from both groups were received.