Sickle Cell Transplantation Evaluation of Long-term and Late Effects Registry (STELLAR) to Compare Long-term Outcomes After Hematopoietic Cell Transplantation to Those in Siblings Without Sickle Cell Disease and in Nontransplanted Individuals With Sickle Cell Disease: Design and Feasibility Study. - Krishnamurti L; Arnold SD; Haight A; Abraham A; Guilcher GM; John T; Bakshi N; Shenoy S; Syrjala K; Martin PL; Chaudhury S; Eames G; et al. (JMIR research protocols, 2022)