title: Diagnostic and certificatory value of fiberoscopy in the estimation of the upper alimentary tract among crews of Polish sea-going vessels.
mesh_terms: D004386:Duodenum; D004724:Endoscopy; D005069:Evaluation Studies as Topic; D005260:Female; D005336:Fiber Optic Technology; D005756:Gastritis / Q000175:diagnosis*; D005773:Gastroscopy; D006801:Humans; D008297:Male; D009326:Naval Medicine; D010437:Peptic Ulcer / Q000175:diagnosis*; D011044:Poland