[1] Univ Washington, Sch Med, Div Pediat Surg, Seattle, WA USA
[2] Seattle Childrens Hosp, 4800 Sand Point Way NE, Seattle, WA 98105 USA
[3] McGill Univ, Hlth Ctr, Harvey E Beardmore Div Pediat Surg, Montreal Childrens Hosp, Montreal, PQ, Canada
[4] Univ Utah, Sch Med, Salt Lake City, UT USA
[5] Howard Univ, Coll Med, Washington, DC USA
[6] Nationwide Childrens Hosp, Columbus, OH USA
[7] Nemours Childrens Hlth, Div Pediat Surg, Lakeland, FL USA
[8] Monroe Carell Jr Childrens Hosp Vanderbilt, Nashville, TN USA
[9] Univ Toronto, Hosp Sick Children, Temerty Fac Med, Toronto, ON, Canada