KWAN WS, CHAN S- wing, LI W- hon. The Birth Ball Experience: Outcome Evaluation of the Intrapartum Use of Birth Ball. Hong Kong J Gynaecol Obstet Midwifery [Internet]. 2023 Mar. 31 [cited 2024 May 4];11(1). Available from: https://hkjgom.org/home/article/view/114