Zheng, Rui
Du, Mulong
Zhang, Baoguo
Xin, Junyi
Chu, Haiyan
Ni, Min
Zhang, Zhengdong
Gu, Dongying
Wang, Meilin
Article History
Received: 22 November 2017
Revised: 18 April 2018
Accepted: 23 April 2018
First Online: 6 June 2018
Competing interests
: The authors declare no competing interests.
: The study data for this analysis were approved by the ethics committees of the data providers and Nanjing Medical University.