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Thus, analysis of the data provided on directed donors allows comparisons between total directed and total volunteer homologous groups, between previous volunteer directed donors and repeat volunteer donor groups, and between first-time-directed and first-time-volunteer homologous groups.
There are ample reasons to be cautious in evaluating the medical efficacy of red blood cells from directed donors.
Are all directed donors who have a previous history of homologous donation being compared as a group with the agglomerate of volunteer homologous donors?

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