UZMA SAEED AND NAVEED MUZHAR. Correlating Serum Beta hCG Levels with Transvaginal Sonographic Features of Ectopic Pregnancy. Journal of Rawalpindi Medical College, Rawalpindi, Pakistan, v. 21, n. 1, 2017. Disponível em: https://mail.journalrmc.com/index.php/JRMC/article/view/111. Acesso em: 21 jan. 2026.