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Sub-analysis of duration of respiratory tract infections (RTIs) in the study period compared to the same period of the previous year (october–march) in (A) whole subgroup of children (n = 624), (B) in children under 4 years old (n = 390) and (C) in children over 4 years old (n = 234). Data from Slovenia, Croatia, Bosnia and Herzegovina, and Serbia were analysed. ***p < 0.001.
