1. Department of Oral Medicine & Radiology, Sardar Patel Postgraduate Institute of Dental & Medical Sciences, Lucknow, Uttar Pradesh, India,
2. Department of Public Health Dentistry, Sardar Patel Postgraduate Institute of Dental & Medical Sciences, Lucknow, Uttar Pradesh, India,
3. Department of Dentistry, All India Institute of Medical Sciences, Patna, Bihar, India,