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Bruera E, Suarez-Almazor M, Velasco A, Bertolino M, MacDonald SM, Hanson J.Bruera E, et al.J Pain Symptom Manage. 1994 Nov;9(8):515-9. doi: 10.1016/0885-3924(94)90113-9.J Pain Symptom Manage. 1994.PMID: 7531736Free article.