Feng, Xin
Chen, Yicheng
Cai, Weihua
Lie, Stein Atle
Hellén-Halme, Kristina
Shi, Xie-Qi
Article History
Received: 5 May 2021
Accepted: 15 August 2021
First Online: 23 August 2021
Declarations
:
: The study was approved by the regional ethics review boards in Dalian, China (DLKQLL201604) and in Bergen, Norway (2018/1547 REK Vest). Informed consent was obtained from all participants or their legal guardians.
: Not applicable as there are no participants’ identifiable data, picture or illustrations that require consent to publish in this manuscript.
: All procedures were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all study participants.
: The authors declare that they have no competing interest.