Funding for this research was provided by:
NAP Start-Up Grant from Nanyang Technological University (N/A)
Major Project of the National Social Science Fund of China (19ZDA227)
Youth Project of the National Social Sciences Fund of China (17CKG021)
Central Plains Civilization Exploration Project in Henan Province (24220078)
57th batch of the China Postdoctoral Science Fund (2015M572113)
Open research project of the Key Laboratory of the Ministry of Education of Cultural Heritage Research and Protection Technology of Northwestern University (xbdx2019–5–18)
Article History
Received: 16 January 2020
Accepted: 11 August 2020
First Online: 23 August 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.