Table 1 Search strategy in Medline (Ovid)

1

Diagnostic imaging/or cardiac imaging techniques/or imaging, three-dimensional/or neuroimaging/or radiography/or radionuclide imaging/or respiratory-gated imaging techniques/or tomography/or ultrasonography/or whole body imaging/

2

exp Radiology/

3

(MRI or x-ray* or xray* or ultrasound* or mammography or ultrasonography or DEXA or DXA or CT or radiograph* or radiolog* or tomography or imaging).tw

4

(CAT adj scan).tw

5

(bone adj scan).tw

6

(Magnetic adj resonance adj imaging).tw

7

1 or 2 or 3 or 4 or 5 or 6

8

exp Health Services Misuse/ or exp Medical Overuse/

9

(Unnecessar* or overuse* or Inappropriate* or waste or wasted or low-value or overdiagn* or overutili* or misuse* or (Low adj value) or unwarrent or redundant).tw

10

(Choosing adj wisely).tw

11

8 or 9 or 10

12

7 and 11

13

Animal/ not (animal/ and human/)

14

12 not 13

15

limit 14 to ((danish or Dutch or English or German or Norwegian or Swedish) and last 10 years)