Funding for this research was provided by:
The key project of the National Natural Science Foundation of China (31630071)
the National Key Program of Research and Development, Ministry of Science and Technology (2016YFC0503200)
the National Science Fund for Distinguished Young Scholars (31325025)
the Natural Science Foundation of Jiangsu Province of China (BK20141449)
Text and Data Mining valid from 2019-10-24
Received: 27 March 2018
Accepted: 5 September 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: This study was carried out in full compliance with the laws of the People’s Republic of China. No specific permits were required for our field investigation. Only cadaver material was used in this study and the animals were not killed for this study.
: Not applicable.
: The authors declare that they have no competing interests.