Xin, Liu
Fan, Wu
Tingting, Du
Zuoming, Sun
Qiang, Zhang
Funding for this research was provided by:
National Natural Science Foundation of China (Grant No.81670086, Grant No.81370183)
Natural Science Foundation of Tianjin City (Grant No.14JCYBJC27800)
major special project for the prevention and control of chronic diseases in Tianjin (Grant No.17ZXMFSY00080)
Article History
Received: 21 July 2018
Revised: 27 September 2018
Accepted: 8 October 2018
First Online: 15 October 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.For this type of study formal consent is not required.