Addiction. 99(4):515, APRIL 2004 Issn Print: 0965-2140 Publication Date: April 2004 Print POSTSCRIPT FROM SMIT ET AL. FILIP SMIT; + Author Information Senior Researcher, Trimbos Institute (The Netherlands Institute of Mental Health and Addiction), PO Box 725, 3500 AS, Utrecht, The Netherlands. E-mail: fsmit@trimbos.nl Checking for direct PDF access through Ovid Abstract Abstract unavailable for this article.