【Author】
YAN Wen 1 ,ZHANG Zhong-bin 2 ,HUJun-feng 3 ,XIAZhao-lin 2 (1.TaianHospital for Occupational Diseases,Taian271000;2.School ofPublic Health,Fudan Uni-versity;Shanghai200032;3.Institute of Health Education,Chinese Center for Disease Control and Prevention;Bei-jing100011,China)