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Charles S. Cleeland; Tito R. Mendoza; Xin Shelley Wang; Chyi Chou; Margaret T. Harle; Marilyn Morrissey; Martha C. Engstrom. (2000). Assessing symptom distress in cancer patients : The M. D. Anderson Symptom Inventory. , 89(7), 1634–1646. doi:10.1002/1097-0142(20001001)89:7<1634::aid-cncr29>3.0.co;2-v 
10.1002/1097-0142(20001001)89:7<1634::aid-cncr29>3.0.co;2-v