[1] Univ Penn, Dept Med, Perelman Sch Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Div Cardiol, Perelman Sch Med, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Obstet & Gynecol, Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Univ Penn, Perelman Sch Med, Penn Cardiovasc Outcomes Qual & Evaluat Res Ctr, Philadelphia, PA 19104 USA