[1] Univ Malaya, Med Ctr, Dept Pediat, Kuala Lumpur 50603, Malaysia
[2] Univ Malaya, Pediat & Child Hlth Res Grp, Kuala Lumpur, Malaysia
[3] Univ Colorado, Sch Med, Dept Pediat, Sect Pediat Cardiol, Aurora, CO USA
[4] Univ Colorado, Sch Med, Inst Heart, Aurora, CO USA
[5] Univ Colorado, Sch Med, Pediat Liver Ctr, Dept Pediat,Sect Pediat Gastroenterol Hepatol & N, Aurora, CO USA
[6] Univ Colorado, Sch Med, Digest Hlth Inst, Aurora, CO USA
[7] Childrens Hosp Colorado, Aurora, CO USA