The "missing link" in the history of cardiac pacing.
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Geddes
D002304:Cardiac Pacing, Artificial / Q000266:history*; D002309:Cardiology / Q000266:history*; D005060:Europe; D049672:History, 19th Century; D049673:History, 20th Century; D010138:Pacemaker, Artificial / Q000266:history*; D014481:United States