1 Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi, India.
2 Division of Pediatric Rheumatology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, 110029, India.
3 Department of Orthopedics, All India Institute of Medical Sciences, New Delhi, India.
4 Division of Pediatric Rheumatology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, 110029, India. drnarendrabagri@yahoo.co.in.