Li, Yating
Li, Yang
Li, Linfeng
Article History
Received: 19 July 2020
Revised: 13 November 2020
Accepted: 7 December 2020
First Online: 12 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All the patients were obtained informed consent following a protocol approved by the ethics board of Qingdao Municipal Hospital, and this study was conducted in accordance with the ethical standards formulated in the Declaration of Helsinki.
: All participants in this study were informed and gave a written consent.