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Caldwell LL, Smith EA.Caldwell LL, et al. Among authors: smith ea.Can J Public Health. 1988 Mar-Apr;79(2):S44-8.Can J Public Health. 1988.PMID: 3383054No abstract available.
Mpofu E, Caldwell L, Smith E, Flisher AJ, Mathews C, Wegner L, Vergnani T.Mpofu E, et al.J Appl Meas. 2006;7(3):323-34.J Appl Meas. 2006.PMID: 16807497
Patrick ME, Collins LM, Smith E, Caldwell L, Flisher A, Wegner L.Patrick ME, et al.Subst Use Misuse. 2009;44(5):647-62. doi: 10.1080/10826080902810244.Subst Use Misuse. 2009.PMID: 19360538Free PMC article.Clinical Trial.