Firat Koca, C., T. Bayindir, E. Koca, and A. Kizilay. “Percutaneous or Surgical Tracheotomy When, Why, and Selection Criteria”. Annals of Medical Research, vol. 23, no. 3, May 2021, pp. 0347-52, http://www.annalsmedres.org/index.php/aomr/article/view/2270.