1. Division of Nursing, Children's National Hospital, Washington, DC, USA.
2. Division of Oncology, Children's National Hospital, Washington, DC, USA.
3. Department of Pediatrics, George Washington University, Washington, DC, USA.
4. Department of Nursing, University of Vermont, Burlington, Vermont, USA.
5. The Conway School of Nursing, The Catholic University of America, Washington, DC, USA.
6. University of Maryland School of Nursing, Baltimore, Maryland, USA.