Funding for this research was provided by:
Basic-Clinical Cooperation Program from Capital Medical University (16JL23)
Article History
Received: 31 May 2018
Accepted: 30 October 2018
First Online: 6 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 Institutional Ethics Committee of the Beijing Friendship Hospital-Affiliate of Capital Medical University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For retrospective study, formal consent is not required.