Funding for this research was provided by:
National Natural Science Foundation of China (81772656, 81101921)
Natural Science Foundation of Guangdong Province (2014A030313298, 2016A030313563)
Received: 31 October 2017
Accepted: 14 May 2018
First Online: 29 May 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Nanfang Hospital. Written informed consent was obtained from all subjects, adhered to the Declaration of Helsinki.
: The authors declare that they have no competing interests.
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