1. Department of ENT and Head & Neck Surgery , A.C.S Medical College , Vellappanchavadi, Chennai , India
2. Department of ENT and Head & Neck Surgery, All Indian Institute of Medical Sciences Mangalagiri , Guntur , Andhra Pradesh, India
3. Department of ENT and Head & Neck Surgery , JIPMER , Pondicherry , India
4. Department of ENT and Head & Neck Surgery, Mahatma Gandhi Medical College and Research Institute , Sri Balaji Vidyapeeth, Pillaiyarkuppam, Pondicherry , India