“In the … long-term heroin … M , there were significantly higher proportions than in those without M of confabulations (respectively, short-term: 77.78 vs 35.36%: x', p < .….82 vs 27.27%, p < .02) and contaminations (respectively, 55.55% vs 0, p < .01; 44.45% vs 0, p < .02).”