About the Authors

Geum Joon Cho

Affiliation Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea

Log Young Kim

Affiliation The Health Insurance Review and Assessment Service of Korea, Seoul, Korea

Hye-Ri Hong

Affiliation Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea

Chang Eun Lee

Affiliation Dongnam Health University, Suwon, Korea

Soon-Cheol Hong

Affiliation Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea

Min-Jeong Oh

mjohmd@korea.ac.kr

Affiliation Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea

Hai-Joong Kim

Affiliation Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GJC HRH LYK CEL SCH MJO HJK. Performed the experiments: GJC HRH LYK CEL SCH MJO HJK. Analyzed the data: GJC HRH LYK CEL SCH MJO HJK. Contributed reagents/materials/analysis tools: GJC HRH LYK CEL SCH MJO HJK. Wrote the paper: GJC HRH LYK.