V. Sreejaraj, P. V. Sumam, V. Nevil, K. Sridevi, and A. R. Vinayakumar, “Prevalence of Helicobacter pylori colonisation in tonsillar tissue in cases of chronic tonsillitis: a prospective study”, Int J Otorhinolaryngol Head Neck Surg, vol. 4, no. 3, pp. 738–741, Apr. 2018.