Lathifah NS, Simamora GYF, Anggraini A. The Effectiveness of Progressive Muscle Relaxation Technique in Reducing Labor Pain During the First Stage of Active Phase. JBC [Internet]. 2026 Mar. 30 [cited 2026 Apr. 22];8(1). Available from: https://ojs.polkespalupress.id/index.php/JBC/article/view/4290