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"Arrhythmias During Upper Gastrointesintal Endoscopy P. K.Mathew, M.D., F.A.C.A. Fernando V. Ona, M.D., Kiril Damevski,..."
<https://d.docksci.com/arrhythmias-during-upper-gastrointestinal-endoscopy_5dcb6ca7097c47e5718b4586.html>