A. Nuanjan, B. Thongthawee, Y. Matchim, and N. Saiphoklang, “The effect of perceived self – efficacy in respiratory muscle training with modified Qigong program on duration of weaning from mechanical ventilator in patients with respiratory failure”, Thai J. Cardio-Thorac Nurs., vol. 32, no. 1, pp. 152–165, Aug. 2021.