title: Spontaneous pneumomediastinum as an occupational hazard.
mesh_terms: D000328:Adult; D002977:Clergy; D006801:Humans; D008297:Male; D008478:Mediastinal Emphysema / Q000000981:diagnostic imaging / Q000209:etiology*; D009784:Occupational Diseases / Q000209:etiology*; D011859:Radiography; D012306:Risk; D013060:Speech