Low-value care-medical services that provide little or no benefit to patients compared with their harms, alternatives and costs-is a common and costly global problem. 1-3 Unnecessary medical services not only yield billions of dollars in wasteful spending each year but also cause physical, psychological and financial harm to patients. 4,5 While campaigns, such as Choosing Wisely, Choosing Wisely Canada and Choosing Wisely UK target practicing clinicians internationally, 6 many medical schools have begun to pre-empt this problem in future generations by teaching students about wasteful care.