%0 Journal Article
%T Drug use: association vs causation
%J Journal of Occupational Medicine
%D 1993
%A Ryan, J.
%A Zwerling, Craig S.
%A Jones, Marc
%V 35
%N 10
%P 984-984
%X Abstract unavailable.
%G 
%I Lippincott Williams and Wilkins
%@ 0096-1736
%U http://dx.doi.org/