1. Department of Ophthalmology, All India Institute of Medical Sciences (AIIMS) Rishikesh, Uttarakhand, India
2. Department of Microbiology, All India Institute of Medical Sciences (AIIMS) Rishikesh, Uttarakhand, India
3. Department of General Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pudcherry, Tamil Nadu, India