[1] Univ Toronto, Hosp Sick Children, Div Gen & Thorac Surg, Dept Surg, Toronto, ON, Canada
[2] Univ Utah, Sch Med, Primary Childrens Hosp, Salt Lake City, UT USA
[3] Nationwide Childrens Hosp, Dept Pediat Surg, Ctr Colorectal & Pelv Reconstruct, Columbus, OH USA
[4] Univ Tennessee, Ctr Hlth Sci, Dept Surg, Div Pediat Surg,Le Bonheur Childrens Hosp,Childre, Memphis, TN 38163 USA
[5] Univ Pittsburgh, Childrens Hosp Pittsburgh, Sch Med, Colorectal Ctr Children,Med Ctr, Pittsburgh, PA USA
[6] Seattle Childrens Hosp, Dept Labs, Seattle, WA USA
[7] Univ Washington, Seattle, WA 98195 USA
[8] Yale Univ, Sch Med, Dept Surg, Pediat Surg Sect, New Haven, CT 06510 USA
[9] Madigan Army Med Ctr, Tacoma, WA 98431 USA
[10] Women & Childrens Hosp Buffalo, Dept Pediat Surg, Buffalo, NY USA
[11] Harvard Med Sch, Massachusetts Gen Hosp, Dept Pediat Surg, Boston, MA USA
[12] Hosp Sick Children, Div Pediat Gen & Thorac Surg, Rm 1524,555 Univ Ave, Toronto, ON M5G 1X8, Canada