YIP, C.-S., SIONG, K.-H., & LEE, H.-C. (2023). Expulsion of a Levonorgestrel-releasing Intrauterine System: a Retrospective Analysis. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, 18(2). https://doi.org/10.12809/hkjgom.18.2.250