Kara, Ozgur, Gulenay Gencosmanoglu Turkmen, Halil Korkut Daglar, Cem Yasar Sanhal, Bergen Laleli Koc, Aykan Yucel, and Dilek Sahin. “A Day 1 HCG Can Differentiate Non-Viable Intrauterine Pregnancy and Ectopic Pregnancy Following Endometrial Curettage”. Annals of Medical Research 27, no. 5 (May 25, 2021): 1422–1427. Accessed March 28, 2024. http://www.annalsmedres.org/index.php/aomr/article/view/765.