title: Discovery of a persistent left superior vena cava during pacemaker implantation.
authors: Department of Cardiology, Albert Schweitzer Hospital, Dordrecht, the Netherlands.
authors: A M
authors: AM
authors: Schreve-Steensma
authors: P H M
authors: PH
authors: van der Valk
authors: J B L
authors: JB
authors: Ten Kate
authors: M J M
authors: MJ
authors: Kofflard