Graber Judith M, Macdonald Steven C, Kass Daniel E, Smith Andrew E, Anderson Henry A
Environmental and Occupational Health Unit, Center for Disease Control and Prevention, Maine Dept. of Health and Human Services, 286 Water St., SHS 11, Augusta ME 04333, USA.
Public Health Rep. 2007 Mar-Apr;122(2):138-44. doi: 10.1177/003335490712200202.