Femoral VeinVenous ThrombosisThrombosisPortal VeinVeinsThrombophlebitisIliac VeinPopliteal VeinPhlebographySaphenous VeinUpper Extremity Deep Vein ThrombosisVaricose VeinsMesenteric VeinsPulmonary EmbolismAnticoagulantsSubclavian VeinJugular VeinsUltrasonography, Doppler, DuplexRenal VeinsVena Cava, InferiorSplenic VeinVenous InsufficiencySinus Thrombosis, IntracranialLegIntracranial ThrombosisVenous ValvesCoronary ThrombosisPostthrombotic SyndromeVena Cava FiltersCatheterization, PeripheralFibrin Fibrinogen Degradation Products