[1] Univ Vermont, Coll Med, Pulm Hypertens Program, Dept Med,Fletcher Allen Hlth Care, Burlington, VT 05401 USA
[2] Univ Vermont, Coll Med, Adult Congenital Heart Dis Program, Dept Med,Fletcher Allen Hlth Care, Burlington, VT 05401 USA
[3] Univ Vermont, Coll Med, Adult Congenital Heart Dis Program, Cardiol Unit,Fletcher Allen Hlth Care, Burlington, VT 05401 USA
[4] Univ Vermont, Coll Med, Pulm Hypertens Program, Cardiol Unit,Fletcher Allen Hlth Care, Burlington, VT 05401 USA