| http://www.w3.org/ns/prov#value | - Pain is the most common symptom reported both in the general population and in primary care,1 the leading cause of work disability,2 and a condition that costs the United States more than $600 billion each year in health care and lost productivity.3 Two-thirds of pain-related outpatient visits are for musculoskeletal pain, accounting for nearly 70 million outpatient visits annually in the United S
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