Funding for this research was provided by:
the Science Research and Development Fund of Capital Medical University (PYZ2017003)
the 1351 Program of Beijing Chao-Yang Hospital (CYXX-2017-20 and CYMY-2017-21)
Text and Data Mining valid from 2020-03-17
Received: 3 December 2019
Accepted: 26 February 2020
First Online: 17 March 2020
Ethics approval and consent to participate
: We received approval for our analysis from the Institutional Review Board of Beijing Chao-Yang Hospital, Capital Medical University (2019-science-121). We collected all blood and endometrial samples after we obtained informed written consent from all study subjects.
: Not applicable.
: The authors declare that they have no conflict of interest.