1 From the Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Atlanta, Georgia (L.C.C.); Advanced Technologies & Laboratories, Gaithersburg, Maryland (A.L.S.); Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Washington, DC (C.-C.C., A.M.C., S.L.T., J.H.); Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, Ohio (H.L.H.).