LUI, K.-Y.; LEE, Y.-T.; SO, C.-H.; YU, E. L. Difference in Serum Human Chorionic Gonadotrophin Levels Measured Using the World Health Organization 3rd versus 5th International Standard: A Correlation Study with Reference to Management of Pregnancy of Unknown Location. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, [S. l.], v. 17, n. 1, 2017. DOI: 10.12809/hkjgom.17.1.219. Disponível em: https://hkjgom.org/home/article/view/219. Acesso em: 2 may. 2024.