[1] Columbia Presbyterian Med Ctr, Dept Pediat, New York, NY 10032 USA
[2] Columbia Presbyterian Med Ctr, Div Pediat Cardiol, New York, NY 10032 USA
[3] Diagnost Ultrasound Associates, Boston, MA USA
[4] Yale Univ, Sch Med, Dept Obstet & Gynecol & Pediat, New Haven, CT USA
[5] Royal Brompton Hosp, Brompton Fetal Cardiol, London SW3 6LY, England
[6] Univ London St Georges Hosp, Fetal Med Unit, London, England
[7] Charite Hosp CCM, Dept Obstet & Gynecol, Berlin, Germany
[8] Norwegian Univ Sci & Technol, Natl Ctr Fetal Med, N-7034 Trondheim, Norway
[9] Med Univ Luebeck, Div Prenatal Med, Luebeck, Germany
[10] Univ S Florida, Coll Med, Dept Pediat, Tampa, FL 33612 USA
[11] Policlin S Orsola Malpighi, Dept Obstet & Gynecol, Bologna, Italy
[12] Erasmus Univ, Acad Hosp Rotterdam Dijkzigt, Dept Obstet & Gynecol, NL-3015 GD Rotterdam, Netherlands
[13] Hadassah Univ Hosp, Dept Obstet & Gynecol, IL-91120 Jerusalem, Israel