The Effectiveness of the Birthing Ball (Gym Ball) on the Progress of Opening the First Stage of Labor in the Working Area of Muka Health Center, Purwakarta District, Purwakarta Regency, Indonesia. arkus [Internet]. 2023 Sep. 28 [cited 2026 Aug. 16];9(2):354-6. Available from: https://hmpublisher.com/index.php/arkus/article/view/384