[1] Univ Massachusetts, Div Pediat Cardiol, Chan Med Sch, Worcester, MA USA
[2] Boston Childrens Hosp, Dept Cardiol, 300 Longwood Ave, Boston, MA 02115 USA
[3] Harvard Med Sch, Dept Pediat, 300 Longwood Ave, Boston, MA 02115 USA
[4] Atrius Hlth, Dept Cardiol, Boston, MA 02116 USA
[5] Brown Univ, Div Pediat Cardiol, Warren Alpert Med Sch, Providence, RI USA
[6] Univ Massachusetts, Dept Obstet & Gynecol, Chan Med Sch, Worcester, MA USA
[7] Univ Massachusetts, Chan Med Sch, Dept Pediat, Worcester, MA USA
[8] Univ Massachusetts, Chan Med Sch, Dept Psychiat, Worcester, MA USA
[9] Univ Massachusetts, Chan Med Sch, Dept Populat & Quantitat Hlth Sci, Worcester, MA USA