Thirunavukkarasu Arun Babu1, Jaiganesh Selvapandiyan2. 1. Department of Pediatrics, All India Institute of Medical Sciences (AIIMS), Mangalagiri, Andhra Pradesh, India babuarun@yahoo.com. 2. Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), Mangalagiri, Andhra Pradesh, India.