[1] Childrens Hosp Los Angeles, Div Pediat Surg, 4650 Sunset Blvd,MS 100, Los Angeles, CA 90027 USA
[2] Univ Southern Calif Los Angels, Dept Surg, Keck Sch Med, Los Angeles, CA USA
[3] Univ Southern Calif Los Angels, Dept Populat & Publ Hlth Sci, Los Angeles, CA USA
[4] Phoenix Childrens Hosp, Div Surg, Phoenix, AZ USA
[5] Univ Utah, Div Pediat Surg, Salt Lake City, UT USA
[6] Primary Childrens Hosp Salt Lake City, Salt Lake City, UT USA
[7] Rady Childrens Hosp San Diego, Div Pediat Surg, San Diego, CA USA
[8] Univ Calif San Diego, Dept Surg, San Diego, CA 92103 USA
[9] Lucile Packard Childrens Hosp, Div Pediat Surg, Palo Alto, CA USA
[10] Stanford Univ, Sch Med, Palo Alto, CA 94304 USA
[11] UCSF, Div Pediat Surg, Benioff Childrens Hosp, San Francisco, CA USA
[12] Univ Calif San Francisco, Sch Med, Dept Surg, San Francisco, CA 94143 USA
[13] Seattle Childrens Hosp, Div Pediat Gen & Thorac Surg, Seattle, WA USA
[14] Univ Colorado, Childrens Hosp Colorado, Aurora, CO USA
[15] Oregon Hlth & Sci Univ, Div Pediat Surg, Dept Surg, Portland, OR USA