Materials and Methods
Study design: Multicentric observational study.
Study setting and duration: The present study was conducted in six institutes of national importance [All India Institute of Medical Sciences (AIIMS) Hyderabad; AIIMS, Mangalagiri; AIIMS, Nagpur; AIIMS, Kalyani; AIIMS, Gorukhpur; and AIIMS, Bhopal] in different states of India over one year.