S. Rai, S. Adhikari, P. Bhandari, K. P. Koirala, B. Karmacharya, and N. Yogi, “Percutaneous dilatational tracheostomy compared with conventional surgical tracheostomy in neurosurgery intensive care unit”, Asian J Med Sci, vol. 11, no. 5, pp. 18–23, Sep. 2020.