Funding for this research was provided by:
Chinese Academy of Medical Sciences (CAMS) Initiative for Innovative Medicine (2017-I2M-1-001)
Text and Data Mining valid from 2018-11-02
First Online: 2 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures involving human participants were performed in accordance with the ethical standards of the Institutional Ethics Committee of Peking Union Medical College Hospital at the Chinese Academy of Medical Sciences & Peking Union Medical College and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.