Research by Sallfors, Hallberg & Fasth (2003) found that _____ reported more pain and a greater number of affected joints than others in the study.

Question

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The research did not mention any differences between boys and girls or between Europeans and Asians. Therefore, the best choice is B, as the study found that one group reported more pain and affected joints than the others, and that group was not specified by gender or ethnicity.

Research by Sallfors, Hallberg & Fasth (2003) Found That _____