Funding for this research was provided by:
National Natural Science Foundation of China (81602148, 81472457, 81602563, 81672871)
Natural Science Foundation of Fujian Province (2015J01523)
Science and Technology Projects of Xiamen City (3502Z20154025)
Received: 6 March 2018
Accepted: 11 April 2018
First Online: 24 April 2018
Ethics approval and consent to participate
: The studies were conducted in accordance with the International Ethical Guidelines for Biomedical Research Involving Human Subjects (CIOMS), and the research protocols were approved by the Clinical Research Ethics Committee of Zhongshan Hospital of Xiamen University. Written informed consents were obtained from the participants before sampling.
: The authors declare that they have no competing interests.
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