LEE, Y.-T., C.-H. SO, W.-P. CHAN, and K.-W. LEE. “Predictors of Success of Methotrexate in the Treatment of Ectopic Pregnancy: A New Perspective”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, vol. 16, no. 1, Jan. 2016, doi:10.12809/hkjgom.16.1.198.