Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2014A030313108)
National Natural Science Foundation of China (81071892, 81272312)
the Fundamental Research Funds for the Central Universities (15ykpy15, 09ykpy30)
the Science and Technology Project of Guangzhou (2014Y2-00129)
Received: 4 October 2016
Accepted: 21 January 2018
First Online: 31 January 2018
Ethics approval and consent to participate
: This study was performed according to the guidelines of the Helsinki Declaration. It was registered and approved by the ethics committee at The First Affiliated Hospital of Sun Yat-sen University. All patients provided written informed consent before treatment.
: The authors declare that they have no competing interests.
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