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Journal of Pain and Symptom Management > 2009 > 38 > 4 > 597-605
Journal of Pain and Symptom Management > 2000 > 19 > 6 > 412-426
Journal of Pain and Symptom Management > 2009 > 38 > 4 > 597-605
Journal of Pain and Symptom Management > 2000 > 19 > 6 > 412-426