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Kaplan-Meier curves showing the recovery from the common cold in the 3 trials pooled and in the individual studies by the zinc and placebo treatments. (A) All 3 trials pooled that had at the start 102 zinc and 97 placebo participants in all [11–13]. (B) Petrus et al [11] study, (C) Prasad et al [12] study, and (D) Prasad et al [13] study.
