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Impact of probiotic supplementation on time to onset of URTI symptoms during the PROMAGEN study. Kaplan-meier plots of time to first URTI symptoms in subgroups of participants who were: A) <45 year olds; B) ≥45 year olds; C) overweight (BMI <30 kg/m2) and; D) obese (BMI ≥30 kg/m2). Statistical analysis was performed using the log-rank Mantel-Cox test
