Fig. 1

Behaviour of yearly number of RTI episodes before and during the 10-year follow-up in the treated (specific extract of duck liver and heart) and untreated groups. Data are reported as mean ± SD values. The p values of the comparison between the two groups are shown in the figure. ^a p < 0.001, ^b p = 0.002, ^c p = 0.006: comparison vs. the previous year within each treatment group