1. Department of Anesthesia, Section of Hospice and Palliative Care, Nationwide Children's Hospital, Columbus, Ohio, USA.
2. Rebecca D. Considine Research Institute, Akron Children's Hospital, Akron, Ohio, USA.
3. Haslinger Family Pediatric Palliative Care Center, Akron Children's Hospital, Akron, Ohio, USA.
4. Department of Anesthesiology and Pain Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA.