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Journal of Pain and Symptom Management > 2008 > 35 > 4 > 388-396
European Journal of Pain > 2006 > 10 > 4 > 379-384
Journal of Pain and Symptom Management > 2008 > 35 > 4 > 388-396
European Journal of Pain > 2006 > 10 > 4 > 379-384