Persistent left superior vena cava: is it an incidental pathology detected during pacemaker implantation or one of the causes of sick sinus syndrome?—Authors’ reply

Stefanos Archontakis

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Elias Sanidas

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Konstantinos Sideris

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Petros Arsenos

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National & Kapodistrian University of Athens Athens , Greece

Konstantinos Gatzoulis

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Skevos Sideris

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Hippokration General Hospital Athens , Greece