Significant site effect was observed:Copyright information:Taken from "Arterial Stiffness and Pharmacological Interventions – The TRanscend Arterial stiffNess Substudy (TRANS study)"Vascular Health and Risk Management 2007;3(4):381-388.Published online Jan 2007PMCID:PMC2291337.© 2007 Dove Medical Press Limited. All rights reserved