Funding for this research was provided by:
Shanghai Chest Hospital (2014YZDH10301, 2014YZDH10302, YZ2015-ZX03)
Shanghai Municipal Commission of Health and Family Planning (201540309)
Article History
Received: 2 April 2018
Accepted: 24 May 2018
First Online: 29 May 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.