1. Department of Microbiology, Mahamana Pandit Madan Mohan Malviya Cancer Centre and Homi Bhabha Cancer Hospital, Varanasi, India.
2. Department of Microbiology, National Cancer Institute, All India Institute of Medical Sciences, New Delhi, India.
3. Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University (BHU), Varanasi, India.