Collateral CirculationRisk FactorsCoronary CirculationCollateral LigamentsCircle of WillisArterial Occlusive DiseasesKidney CalicesCerebrovascular CirculationCoronary AngiographyCoronary DiseaseCerebral AngiographyAngiographyCoronary OcclusionLiver CirculationProspective StudiesHypertension, PortalAngina PectorisIschemiaTime FactorsMedial Collateral Ligament, KneeConstriction, PathologicLigationCoronary VesselsBalloon OcclusionRegional Blood FlowFollow-Up StudiesBlood Flow VelocityMagnetic Resonance AngiographyCineangiographyCarotid Artery, InternalRetrospective StudiesCeliac ArteryBlood CirculationCardiovascular DiseasesTreatment OutcomeCerebral ArteriesBlood PressureAngioplasty, Balloon, CoronaryDoppler EffectCoronary Artery DiseaseCohort StudiesSmokingMyocardial InfarctionCoronary StenosisRisk AssessmentCerebral Arterial Diseases