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There are two corresponding authors for this paper as follows:

Qing Lan, Occupational & Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH 9609 Medical Center Drive, Room 6E138, Rockville, Maryland 20850, USA; qingl{at}mail.nih.gov

Yuxin Zheng, National Institute of Occupational Health and Poison Control, China CDC No 29, Nanwei Road, Beijing, 100050, P. R. China; zhengyx{at}chinacdc.cn