title: Cell transplantation and research design.
authors.forename: D L
authors.initials: DL
authors.lastname: Felten
mesh_terms: D016380:Brain Tissue Transplantation; D002986:Clinical Trials as Topic; D035061:Control Groups; D033042:Fetal Research; D016332:Fetal Tissue Transplantation; D006801:Humans; D010300:Parkinson Disease / Q000601:surgery*; D012107:Research Design