ADAMTS13 and deep vein thrombosis: In this study, we investigated the functional role of nine rare ADAMTS13 variants (p.Val154Ile, p.Asp187His, p.Thr339Arg, p.Arg421Cys, p.Tyr603Cys, p.Asp836Gly, p.Arg925Gly, p.His1196Gln and p.Thr1249Pro) identified in eight Italian DVT patients and previously reported to be associated with DVT on burden testing [8].