Funding for this research was provided by:
National Natural Science Foundation of China (81330065, 81673149)
Text and Data Mining valid from 2019-10-11
Received: 7 April 2019
Accepted: 8 September 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: The study design was ethically approved by the Ethics Committee of Capital Medical University (2013SY35). All participants were provided written informed consent at the beginning of the study.
: All the co-authors and participants have given their consent for publication in Clinical Epigenetics.
: The authors declare that they have no competing interests.