Tülin Durgun Yetim, et al. “Effects of Surgical and Percutaneous Tracheotomy on Thyroid Hormones”. Annali Italiani Di Chirurgia, vol. 90, no. 1, Jan. 2019, pp. 10-13, https://annaliitalianidichirurgia.it/index.php/aic/article/view/872.