Kilicgun, A., A. Ozel, O. Yaksi, and M. Unal. “Commonly Administered Physiotherapy Techniques in Thoracic Surgery Clinics in Turkey”. Annals of Medical Research, vol. 28, no. 6, June 2021, pp. 1172-5, http://www.annalsmedres.org/index.php/aomr/article/view/3824.