You remark on the high number of computed tomography (CT) scans used in Greece, but only risk–benefit analysis and cost-effectiveness studies will indicate whether this is a good or a bad thing (Nature 502, S82–S83; 2013). Your claim that the country has no official guidelines governing the use of CT scans is not correct.

CT scanners in Greece have been regularly monitored under strict guidelines since 2001. And diagnostic and therapeutic protocols in radiology were implemented in 2011.

Peculiarities in Greece's health system contribute to the high level of CT scanner use. The number of doctors per capita is almost double the average for countries in the Organisation for Economic Co-operation and Development, which may result in overprescription of diagnostic procedures. This could be due in part to the relatively low cost of CT scans in Greece (US$88 for a chest scan, for example, compared with $332 in the United States). A new electronic referral system has now been set up that should discourage overprescribing.