Funding for this research was provided by:
Beijing Municipal Science and Technology Commission (Z171100001017209)
National Natural Science Foundation of China (81703896)
Capital Health Research and Development of Special (2016-2-4062)
Text and Data Mining valid from 2018-11-11
Received: 14 July 2018
First Online: 11 November 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 for study participation was obtained from each patient.