Funding for this research was provided by:
China Medical Board (Grant CMB 98-688)
National Natural Science Foundation of China (Grants 30240013 and 30370680)
Text and Data Mining valid from 2018-06-25
Received: 22 February 2018
Accepted: 6 June 2018
First Online: 25 June 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.