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de Craen AJ, Di Giulio G, Lampe-Schoenmaeckers JE, Kessels AG, Kleijnen J.de Craen AJ, et al. Among authors: kleijnen j.BMJ. 1996 Aug 10;313(7053):321-5. doi: 10.1136/bmj.313.7053.321.BMJ. 1996.PMID: 8760737Free PMC article.