Population-based survey of pain in the united states: Differences among white, african american, and hispanic subjects☆
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☆ This study was supported by an unrestricted grant from Purdue Pharma L.P.
PII: S1526-5900(04)00824-7
doi:10.1016/j.jpain.2004.05.005
© 2004 American Pain Society. Published by Elsevier Inc. All rights reserved.
