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Authors' Response

Hartley, Tara A. PhD, MPA, MPH; Burchfiel, Cecil M. PhD, MPH; Fekedulegn, Desta PhD; Andrew, Michael E. PhD; Shankar, Anoop MD, PhD; Knox, Sarah S. PhD; Violanti, John M. PhD

Journal of Occupational & Environmental Medicine:
doi: 10.1097/JOM.0b013e31823402e3
Letters to the Editor