Duvvi, Shyam, P Neelapala, A S Duvvi, and B Nirmal Kumar. 2017. “How We Do It: A DIY Smart Phone Based ENT Endoscopy”. Bengal Journal of Otolaryngology and Head Neck Surgery 25 (3). Kolkata, India:176-79. https://doi.org/10.47210/bjohns.2017.v25i3.148.