The effect of slow deep breathing relaxation exercise on pain levels during and post chest tube removal after coronary artery bypass graft surgery oleh Mohamad I. Jarrah, Issa M. Hweidi, Sirin A. Al-Dolat, Hossam N. Alhawatmeh, Salwa M. Al-Obeisat, Lama I. Hweidi, Aysam I. Hweidi, Osama A. Alkouri