No abstract available
MeSH terms
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Adolescent
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Atrioventricular Block / diagnosis
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Atrioventricular Block / therapy
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Defibrillators, Implantable*
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Echocardiography / methods
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Electrocardiography*
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Exercise Test
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Follow-Up Studies
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Humans
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Recurrence
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Syncope / diagnosis
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Syncope / therapy*