1. Department of Anaesthesiology, All India Institute of Medical Sciences Rishikesh, Rishikesh, India
2. Department of Anaesthesiology, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, India
3. Department of Neurosurgery, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, India
4. Department of Community Medicine, Government Doon Medical College, Dehradun, India