[1] Childrens Hosp Philadelphia, Ctr Fetal Diag & Treatment, Philadelphia, PA 19104 USA
[2] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[3] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[4] Fetal Care Dallas, Dallas, TX USA
[5] St Louis Univ, St Louis, MO 63103 USA
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA
[7] Univ N Carolina, Raleigh, NC USA
[8] Univ Calif Davis, Sacramento, CA 95817 USA
[9] Childrens Hosp Minnesota, Minneapolis, MN USA
[10] Baylor Coll Med, Houston, TX 77030 USA
[11] Fetal Care Ctr Cincinnati, Cincinnati, OH USA
[12] Childrens Hosp Zurich, Zurich, Switzerland
[13] Univ Calif San Francisco, Mill Valley, VA USA
[14] Weill Cornell Med, New York, NY USA
[15] George Washington Univ, Biostat Ctr, Rockville, MD USA
[16] Univ Michigan, Ann Arbor, MI 48109 USA
[17] Mem Hermann Texas Med Ctr, Pediat Surg & Pediat Surg Crit Care UT Phys, Houston, TX USA
[18] Childrens Hosp Wisconsin, Milwaukee, WI 53201 USA
[19] Univ Colorado, Sch Med, Dept OBGYN, Aurora, CO USA