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APA Citation
Pons-Estel, G. J., Ugarte-Gil, M. F., Harvey, G. B., Wojdyla, D., Griffin, R., Saurit, V., Soriano, E., Bonfa, E., Massardo, L., Cardiel, M. H., Vila, L. M., Alarcón, G. S., & Pons-Estel, B. (n.d.). 289 Comparison of ACR 1982/1997 and EULAR/ACR classification criteria for systemic lupus erythematosus in two multiethnic cohorts. Lupus science & medicine, 6, A209–A210. http://access.bl.uk/ark:/81055/vdc_100144725091.0x000001