Curtis, J. R., Chen, S., Werther, W., John, A., & Johnson, D. A. (2011). Validation of ICD-9-CM Codes to Identify Gastrointestinal Perforation Events in Administrative Claims Data among Hospitalized Rheumatoid Arthritis Patients.

Curtis, Jeffrey R., Shih-Yin Chen, Winifred Werther, Ani John, and David A. Johnson. Validation of ICD-9-CM Codes to Identify Gastrointestinal Perforation Events in Administrative Claims Data Among Hospitalized Rheumatoid Arthritis Patients. 2011.

Curtis, Jeffrey R., et al. Validation of ICD-9-CM Codes to Identify Gastrointestinal Perforation Events in Administrative Claims Data Among Hospitalized Rheumatoid Arthritis Patients. 2011.