[1] All India Inst Med Sci, Dept Microbiol, New Delhi 110029, India
[2] All India Inst Med Sci, Dept Biostat, New Delhi, India
[3] PGIMER & Dr Ram Manohar Lohia Hosp, Dept Dermatol STDs & Leprosy, New Delhi, India
[4] All India Inst Med Sci, Dept Dermatol & Venereol, New Delhi, India