- Arm I: Each dyad receives institution-specific usual care for 6 months, which typically includes psychosocial support for the HSCT recipient and individualized or group education and support for the accompanying parent during the peri-transplant period. They also receive the Web-based Hematopoietic Stem Cell Transplantation (HSCT-) Comprehensive Health Enhancement Support System (HSCT-CHESS) intervention for 6 months. Accompanying parents also may identify a companion to receive access to the HSCT-CHESS Web site.