Funding for this research was provided by:
the 5010 Clinical Research Program of Sun yet-sen University (2017004)
the Science and Technology Program of Guangzhou of China (201704020092)
Received: 15 March 2019
Accepted: 9 September 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: This study was approved by the Sun Yat-sen University Ethics Committee for Research and Publication.
: All participants included in this study have consented to having this research published in an international, peer-reviewed journal.
: The authors declare that they have no competing interests.