Das, S. ., and P. K. . Dutta. “Incidence and Associated Risk Factors of Endotracheal and Tracheostomy Tube Blockage in Intensive Care Unit”. Journal of Chittagong Medical College Teachers' Association, vol. 32, no. 2, Dec. 2021, pp. 132-6, doi:10.3329/jcmcta.v32i2.67200.