Affiliation: | 1.Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA ;2.Environmental and Occupation Medicine and Epidemiology Division of the Department of Environmental Health, Harvard T.H. Chan School of Public Health, 667 Huntington Ave, Boston, MA, 1402-176, USA ;3.Danish Cancer Society Research Center, Copenhagen, Denmark ;4.Department of Comparative Human Development, University of Chicago, Chicago, IL, USA ;5.National Rehabilitation Center for Neuromuscular Disorders, Copenhagen, Denmark ; |