IU, F. Y., S. P. YONG, and H.-C. LEE. “Management of Insufficient Endometrial Biopsy for Investigation of Premenopausal Abnormal Uterine Bleeding”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, vol. 14, no. 1, Jan. 2014, doi:10.12809/hkjgom.14.1.165.