RecruitingBehavioural interventionMultidisciplinary Intervention for Adults With Chronic Graft-versus-host DiseaseThe goal of this study is to demonstrate the efficacy of a multidisciplinary group-based telehealth intervention (HORIZONS) compared to minimally enhanced usual care for improving self-management and quality of life for hematopoietic stem cell transplant (HSCT) survivors living with chronic graft-versus host disease, and to identify critical facilitators and barriers for HORIZONS implementation and adoption.