Massachusetts department of public health.
D001281:Atrial Fibrillation / Q000209:etiology*; D004564:Electrocoagulation / Q000009:adverse effects* / Q000295:instrumentation; D019723:Endoscopes; D004724:Endoscopy / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008482:Mediastinum; D008875:Middle Aged