An origin for controversy is the rise in the number of diagnoses in the US;[17] the diagnosis is more likely in the US than in the UK.[2] The British National Institute on Health and Clinical Excellence (NICE) guidelines on bipolar disorder in 2006 described the broadened criteria used in the US to diagnose bipolar disorder in children as suitable "only for research" with uncertain evidence supporting the diagnosis, leading to inappropriate pharmaceutical treatment.[18]: 526