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Journal of Pain and Symptom Management > 2013 > 46 > 2 > 161-172
Journal of Pain and Symptom Management > 2009 > 38 > 6 > 894-902
Journal of Pain and Symptom Management > 2013 > 46 > 2 > 161-172
Journal of Pain and Symptom Management > 2009 > 38 > 6 > 894-902