Funding for this research was provided by:
Science and Technology Support Project of Xinjiang Uygur Autonomous Region (2016E02062)
Text and Data Mining valid from 2019-03-18
Received: 12 December 2017
Accepted: 13 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki and was approved by Ethics Committee of the Southern Medical University. Prior to enrolment in the study, all participants gave signed informed consent after receiving written and oral information, in addition participants younger than 16 had to bring written permission from their guardians.
: Not applicable.
: The authors declare that they have no competing interests.
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