Funding for this research was provided by:
Anhui Department of Education (KJ2018A1023, KJ2018A1030)
National Natural Science Foundation of China (61601263)
Article History
Received: 5 July 2019
Accepted: 11 September 2019
First Online: 25 September 2019
Competing Interests
: A direct family member of B.S. owns stock in the HeaLink Ltd., Bengbu, China. The other authors declare no competing interests.