Funding for this research was provided by:
National Natural Science Foundation of China (81871457)
National Natural Science Foundation of China (51775368, 51811530310)
Science and Technology Project of Tianjin (18YFZCSY01300)
Article History
Received: 10 January 2019
Accepted: 15 April 2019
First Online: 26 April 2019
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.