Nae Ry Kim, So Ra Yoon, June Seek Choi, Hyun Kyong Ahn, So-Young Lee, Dal Soo Hong, Jeong Sup Yun, Seong Yeon Hong, Yoon Ha Kim, Jung Yeol Han

Obstet Gynecol Sci.2018;61(6):649-654.   Published online 2018 October 12     DOI: http://dx.doi.org/10.5468/ogs.2018.61.6.649