Funding for this research was provided by:
College of Health and Human Development and the Department of Nutritional Sciences, The Pennsylvania State University (Start-up Grant)
Received: 23 December 2020
Accepted: 27 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: This study strictly followed the Declaration of Helsinki and was approved by the Ethics Review Board of the Kailuan General Hospital. Participants provided written informed consents.
: The authors declare that they have no competing interests.