Simarmata PC, . H, Armarin FD. Effect Of Progressive Muscle Relaxation And Deep Breathing On Anxiety And Quality Of Life In Patients Covid-19. JKF [Internet]. 2022 Oct. 30 [cited 2024 Nov. 23];5(1):167-72. Available from: https://ejournal.medistra.ac.id/index.php/JKF/article/view/1400