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But variation within countries was generally less than between countries authors note But the variation within countries was generally less than between countries the authors note NegativeBut the extent of the differences across countries was really Singh said by email http://www.reuters.com/news/health/article/us-health-heart-devices/cardiac-devices-can-cost-six-times-more-in-u-s-than-in-europe-idUSKCN1ND2RS2018-11-09