title: [Frequency of X-ray exposure by pre-employment chest X-ray examination].
authors: Department of Preventive Medicine and Public Health, School of Medicine, Tokyo, Japan.
authors: T
authors: T
authors: Muto
authors: H
authors: H
authors: Sakurai
mesh_terms: D004651:Employment; D006801:Humans; D011829:Radiation Dosage; D013902:Radiography, Thoracic