Patmano, G., T. Bingol Tanriverdi, F. Tugba Bozkurt, and M. Tercan. “Retrospective Evaluation of Percutaneous Tracheostomy Cases Performed by Griggs Method in Intensive Care Unit”. Annals of Medical Research, vol. 27, no. 10, May 2021, pp. 2789-93, http://annalsmedres.org/index.php/aomr/article/view/977.