Funding for this research was provided by:
Ministry of Health and Welfare (HI18C1999)
Text and Data Mining valid from 2019-12-01
Received: 12 July 2019
Accepted: 17 October 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The study population consisted of participants recruited from the Department of Obstetrics and Gynecology of CHA Bundang Medical Center, CHA University (Seongnam-si, Korea) between March 2010 and December 2012. The Institutional Review Board of CHA Bundang Medical Center reviewed and approved the study on 23 February 2010 (reference no. PBC09–120). Informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests