YIP, C.-S., K.-H. SIONG, and H.-C. LEE. “Expulsion of a Levonorgestrel-Releasing Intrauterine System: A Retrospective Analysis”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, vol. 18, no. 2, Apr. 2023, doi:10.12809/hkjgom.18.2.250.