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ECG phenomena: alternating QRS morphologies

https://doi.org/10.1136/heartjnl-2013-305290

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    Footnotes

    • Contributors CP: concept and drafting of the manuscript. NP: illustrations and critical revision. RAG: critical revision and approval of the manuscript.

    • Competing interests None.

    • Patient consent Obtained.

    • Provenance and peer review Not commissioned; internally peer reviewed.

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