Rajan, D. N., D. J. S. C, D. Q. Salim, and D. G. Sanjeev. “A Clinical Study Of Percutaneous Tracheostomy In Medical ICU By Non Surgical Doctors: Clinical Study Of Percutaneous Tracheostomy by Non Surgical Doctors”. National Journal of Integrated Research in Medicine, vol. 5, no. 1, Feb. 2014, pp. 6-9, http://nicpd.ac.in/ojs-/index.php/njirm/article/view/2267.