Improving Safety in Catheter Ablation for Atrial Fibrillation: A Prospective Study of the Use of Ultrasound to Guide Vascular Access. - WYNN, GARETH J.; HAQ, IRAM; HUNG, JOHN; BONNETT, LAURA J.; LEWIS, GAVIN; WEBBER, MATTHEW; WAKTARE, JOHAN E.P.; MODI, SIMON; SNOWDON, RICHARD L.; HALL, MARK C.S.; TODD, DERICK M.; GUPTA, DHIRAJ (Journal of Cardiovascular Electrophysiology, 2014)