1. Departments of Hematology and Oncology, Children's National Medical Center; 111 Michigan Avenue NW Washington DC 20010 USA
2. Department of Psychology; University of Alabama at Birmingham; 1300 University Blvd, CH 201 Birmingham AL 35294 USA
3. Department of Psychology; St. Jude Children's Research Hospital; 262 Danny Thomas Place Memphis TN 38105 USA
4. Department of Pediatrics; Division of Pediatric Hematology and Oncology, University of Alabama at Birmingham; 1600 7th Avenue S., Lowder Building 512 Birmingham AL 35233 USA