Sudachom, W., A. Kongsomchom, S. Thanapipatsiri, and H. Sappasuk. “Incentive Spirometry and Deep Breathing Exercise for Improving Respiratory Volume in Preoperative Spine Surgery Patients”. Siriraj Medical Bulletin, vol. 16, no. 1, Jan. 2023, pp. 1-9, doi:10.33192/smb.v16i1.259101.