1. From the University of Chicago Medical Center (S.C., L.S., L.W., W.T., K.T.S., A.O., V.M.-A., R.M.L.), Chicago, Ill; Philips Healthcare (I.S.S., M.C., S.S.), Andover, Mass; and the University of Occupational and Environmental Health (M.T.), School of Medicine, Kitakyushu, Japan.