Funding for this research was provided by:
National Natural Science Foundation of China (81770152, 91642111)
Guangdong Provincial Applied Science and Technology Research & Development Program (2016B020237006)
Guangzhou Science and Technology Project (201510010211, 20180710004, 201803040017)
Received: 7 May 2019
Accepted: 22 May 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: All of the procedures were conducted according to the guidelines of the Medical Ethics Committees of the Health Bureau of the Guangdong Province of China. This study was approved by the Ethics Committee of the first affiliated hospital of Jinan University.
: Not applicable.
: The authors declare that they have no competing interests.