Funding for this research was provided by:
National Natural Science Foundation of China (No. 81572189)
Xiamen Municipal Bureau of Science and Technology (No. 3502Z20154018, No. 3502Z20159015)
Text and Data Mining valid from 2019-07-10
Received: 30 November 2018
Accepted: 24 June 2019
First Online: 10 July 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of Medical School, Xiamen University, China. Signed informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.