[1] Amrita Vishwa Vidyapeethem, Amrita Inst Med Sci, Dept Resp Med, Kochi, Kerala, India
[2] Amrita Vishwa Vidyapeethem, Amrita Inst Med Sci, Dept Microbiol, Kochi, Kerala, India
[3] Amrita Vishwa Vidyapeethem, Amrita Inst Med Sci, Dept Pathol, Kochi, Kerala, India
[4] Amrita Vishwa Vidyapeethem, Amrita Inst Med Sci, Dept Emergency Med, Kochi, Kerala, India