Ramesh Kumar, Fakhir Raza Haidri, Heeralal, and Bushra Zafar. “COMPARISON OF CHULA FORMULA WITH STANDARD 21 23 RULE FOR ESTIMATION OF OROTRACHEAL TUBE DEPTH IN INTUBATED ADULT PATIENTS: A SINDH INSTITUTE OF UROLOGY AND TRANSPLANTATION EXPERIENCE”. Journal of Ayub Medical College Abbottabad 35, no. 1 (January 15, 2023): 114–117. Accessed May 3, 2025. https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/11237.