S. Thongdee, P. Srimoragot, and P. Chatrkaw, “The Association between Selected Demographic Data, Postoperative Pain, Anxiety, Complications, Pulmonary Complications and Physiological Recovery of Patients after Major Abdominal Surgery in Critical Stage”, ์Nurs Sci J Thail, vol. 29, no. 2, pp. 129–139, Sep. 2012.