DRD4 and Ehlers-Danlos syndrome: In this study, we have investigated 4 common SNPs (DRD2/ANKK1-rs1800497; DRD2-rs6277; DRD4-rs936461; DRD4-rs1800955), one TR (DRD4-120bp TR), and one VNTR (DRD4-48 bp VNTR) and their possible association with EDs in a large cohort of Italian patients.