- Correspondence to Associate Professor Xiaomei Dong, Center for Injury Prevention and Control, Medical College of Jinan University, No.601 Huangpu avenue west, Guangzhou City, Guangdong Province 510632, China;
- Received 25 August 2016
- Revised 13 February 2017
- Accepted 1 March 2017
- Published in print 5 April 2017.
- Published online 6 April 2017.
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