Funding for this research was provided by:
National Natural Sciences Foundation of China (No. 81703027)
Science and Technology Department of Jiangsu Province (SBE2016740780)
Received: 19 December 2018
Accepted: 17 May 2019
First Online: 1 June 2019
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of the First Affiliated Hospital of Nanjing Medical University (2016-SR-220). All subjects signed informed consent forms.
: Not applicable.
: The authors declare that they have no competing interests.