Niu, Rongmei
Han, Ke
Xiang, Zhaolong
Qiao, Li
Siegrist, Theo M.
Article History
Received: 6 March 2020
Accepted: 4 July 2020
First Online: 6 August 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All data needed to evaluate the conclusions in the paper are present in the paper. Additional data related to this paper may be requested from the authors.