?:authorAffiliation
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[\'Occupational and Environmental Medicine Department, Assiut University, Asyut 715715, Egypt.\', \'Chest Disease Department, Faculty of Medicine, Assiut University, Asyut 715715, Egypt.\', \'Cardiothoracic Surgery Department, Faculty of Medicine, Assiut University, Asyut 715715, Egypt.\', \'Public Health Department, Faculty of Medicine, Assiut University, Asyut 715715, Egypt.\']
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