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Journal of Pain and Symptom Management > 1998 > 15 > 1 > 8-17
Journal of Pain and Symptom Management > 1996 > 11 > 4 > 231-241
Journal of Pain and Symptom Management > 1998 > 15 > 1 > 8-17
Journal of Pain and Symptom Management > 1996 > 11 > 4 > 231-241