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Callhoff, Johanna, Katinka Albrecht, Georg Schett, Angela Zink, et Gisela Westhoff. "Depression Is a Stronger Predictor of the Risk to Consider Work Disability in Early Arthritis Than Disease Activity or Response to Therapy." RMD Open 2015.

Callhoff, Johanna, et al. "Depression Is a Stronger Predictor of the Risk to Consider Work Disability in Early Arthritis Than Disease Activity or Response to Therapy." RMD Open 2015.