Anton J.M. De Craen, Placebo effect in the treatment of duodenal ulcer (abstract), in British Journal of Clinical Pharmacology, Londra, British Pharmacological Society, dicembre 1999, pp. 853-860, DOI:10.1046/j.1365-2125.1999.00094.x.
Anton J.M. De Craen, Placebo effect in the treatment of duodenal ulcer (abstract), in British Journal of Clinical Pharmacology, Londra, British Pharmacological Society, dicembre 1999, pp. 853-860, DOI:10.1046/j.1365-2125.1999.00094.x.