Satvinder Singh Bakshi1, Vinoth Kumar Kalidoss2. 1. Department of ENT and Head & Neck Surgery, AIIMS Mangalagiri, 522503, Guntur, Andhra Pradesh, India. saty.bakshi@gmail.com. 2. Department of Community and Family Medicine, AIIMS Mangalagiri, 522503, Guntur, Andhra Pradesh, India.