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Which pain assessment tool has been effective for assessing pain in a cognitively intact elderly adult who might have some moderate to severe cognitive deficits?

According to the American Geriatrics Society, pain is a common and often under-recognized problem in older adults, especially those with cognitive impairments. Choosing the right assessment is crucial for effective treatment, but what is the most effective pain assessment tool for a cognitively intact elderly adult who might have some moderate to severe cognitive deficits?