[1] Univ Southern Calif, Childrens Hosp Los Angeles, Keck Sch Med, Div Pediat Surg, Los Angeles, CA USA
[2] Oregon Hlth & Sci Univ, Dept Radiol, Portland, OR 97201 USA
[3] Univ Southern Calif, Childrens Hosp Los Angeles, Keck Sch Med, Div Anat Pathol,Dept Pathol & Lab Med, Los Angeles, CA USA