Ananda, P., and Sony. “Early Tracheostomy in Prolonged Mechanical Ventilation Due to Severe Head Injury to Prevent Ventilator-Associated Pneumonia (VAP)”. Indonesian Journal of Anesthesiology and Reanimation, vol. 4, no. 2, July 2022, pp. 115-9, doi:10.20473/ijar.V4I22022.115-119.