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Cumulative closure for venous ulcers treated with PRFM membrane.7 Graph depicts wounds responding to PRFM treatment (n = 13; >75% closure by week 16) and nonresponding (n = 4; <75% closure by week 16). Percent closure was calculated from ulcer area reduction normalized to initial baseline area. Values are given as mean percent closure ± standard error of the mean for each visit.
