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[Comment] Pain in the USA: states of suffering

Worldwide, chronic pain afflicts more than 1·5 billion individuals.1 In 2013, pain was in the top ten list of causes of years lived with disability (YLD) in 188 countries: low-back pain accounted for more than a mean of 72 million YLD, neck pain more than 34 million YLD, and migraine more than 28 million YLD.2

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