Funding for this research was provided by:
National Natural Science Foundation of China (31500906, 31571128)
First Online: 8 January 2020
Compliance with ethical standards
: We declared that we have not submitted a related or duplicate manuscript for publication elsewhere and there is no any financial, personal, or professional conflict interests.
: All study procedures were approved by the Ethical Committee of the South China Normal University, and were conducted in accordance with the Declaration of Helsinki.
: Informed consent was obtained from all individual participants included in the study.