[1] Amrita Inst Med Sci, Res Ctr, Pediatr & Pediat Cardiol, Cochin, Kerala, India
[2] Amrita Inst Med Sci, Paediatr Cardiol, Kochi, Kerala, India
[3] Mehta Inst Cardiol & Res Ctr, Pediatr Cardiol, Ahmadabad, Gujarat, India
[4] Amrita Inst Med Sci & Res Ctr, Med Res, Cochin, Kerala, India
[5] Univ Toronto Dalla Lana Sch Publ Hlth, Div Epidemiol, Toronto, ON, Canada
[6] Amrita Inst Med Sci & Res Ctr, Dept Pediat Cardiol, Cochin, Kerala, India