Funding for this research was provided by:
National Natural Science Foundation of China (NSFC-81473051, NSFC-81522040)
the Program for HUST Academic Frontier Youth Team (none)
Text and Data Mining valid from 2019-06-12
Received: 25 April 2019
Accepted: 3 June 2019
First Online: 12 June 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the Ethics and Human Subject Committee of School of Public Health, Tongji Medical College, Huazhong University of Science and Technology and Dongfeng General Hospital, DMC.
: All participants in this study gave written informed consent.