M. S., S. R., and R. P. R. “Study of Serum Adenosine Deaminase Levels in Head and Neck Malignancies”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 6, no. 11, Oct. 2020, pp. 2069-74, doi:10.18203/issn.2454-5929.ijohns20204634.