Cicek, M., E. Gedik, A. Yucel, A. Koroglu, and M. Ozcan Ersoy. “Our Conclusions at Percutaneous Tracheostomy Performed With Griggs Technique”. Annals of Medical Research, vol. 14, no. 1, May 2021, pp. 0017-20, http://www.annalsmedres.org/index.php/aomr/article/view/3147.