1 Department of Otorhinolaryngology and Head-Neck Surgery, KMCH Institute of Health Sciences and Research, Coimbatore 641014, India. Electronic address: pirabusakthivel@gmail.com.
2 Department of Radiation Oncology, All India Institute of Medical Sciences, Patna, India.
3 Department of Pulmonary Medicine, Safdurjung Hospital, New Delhi, India.
4 ESIC Medical College, Faridabad, India. Electronic address: shekhar.kunal09@gmail.com.