1. From the Division of Urology, University of Texas Houston Medical School, Houston, Texas (MLR), Department of Surgery, Children’s Hospital, Boston, Massachusetts (RCS), Division of Pediatric Urology, Maine Medical Center, Portland, Maine (TH), Department of Pediatric Surgery, Denver Children’s Hospital, Denver, Colorado (GH), Department of Pathology, Johns Hopkins Hospital, Johns Hopkins University, Baltimore, Maryland (PA), and National Wilms Tumor Study Data and Statistical Center, Seattle,...