doi:10.1017/S1368980011001364, Published online by Cambridge University Press 11 July 2011
In the results paragraph of the Abstract,
instead of:
Drug users had an average serum Se level of 69·8 (sd 32·8) μg/dl, and 82 % were considered deficient (<85 μg/dl).
it should read:
Drug users had an average serum Se level of 69·8 (sd 32·8) μg/l, and 82 % were considered deficient (<85 μg/l).
Serum Se units of μg/l are correct as published in the remainder of the research article.