[1] King Edward Med Univ, Dept Cardiol, Lahore 54000, Punjab, Pakistan
[2] King Edward Med Univ, Dept Med, Lahore, Pakistan
[3] St Vincent Hosp, Dept Internal Med, Worcester, MA USA
[4] Univ Mississippi, Med Ctr, Dept Med, Jackson, MS USA
[5] Lahey Hosp & Med Ctr, Beth Israel Lahey Hlth, Div Cardiovasc Med, Burlington, MA USA
[6] Boston Childrens Hosp, Dept Cardiol, Boston, MA USA
[7] Harvard Med Sch, Dept Pediat, Boston, MA USA
[8] Donald & Barbara Zucker Sch Med, Childrens Heart Ctr, Cohen Childrens Med Ctr Northwell Hlth, New York, NY USA