Letters to the Editor: PDF OnlyAuthors' ResponseCady, L D M.D.; Bischoff, D P M.P.H.; O'Connell, E R M.S.; Thomas, P C B.A.; Allan, J H M.D.Journal of Occupational Medicine: November 1979 - Volume 21 - Issue 11 - p 720,725 Free ©1979 The American College of Occupational and Environmental Medicine
