Shun-xian CHEN ; Guo-ping ZHU ; Guo-qiang LIAO ; Wu LU ; Wun-feng GUO
Chinese Journal of Industrial Hygiene and Occupational Diseases 2003;21(3):224-224
Adult ; Air Pollutants, Occupational ; poisoning ; Humans ; Male ; Middle Aged ; Occupational Diseases ; etiology ; Occupational Exposure ; adverse effects ; Pneumoconiosis ; etiology ; Silicon Dioxide ; poisoning