Funding for this research was provided by:
Young Scientists Fund (81803204)
the Jiangsu Provincial Youth Medical Talent program (QNRC2016536)
the Jiangsu Province’s Outstanding Medical Academic Leader program (CXTDA2017029)
the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJB330006)
the Jiangsu Provincial Philosophy and Social Science Program (2018SJA0974)
Received: 28 September 2018
Accepted: 29 August 2019
First Online: 5 September 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Xuzhou Medical University and written informed consent was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests.