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Caterpillar plots of the group specific (small diamonds) and summary (large open diamond) Acinetobacter VAP incidence per 1000 mechanical ventilation days and 95 % CI for groups from the French (top) studies, and studies from other European countries. For comparison, the summary Acinetobacter VAP incidence (vertical line) derived from the studies from French groups is shown for reference. Studies are listed in Additional file 1: Tables S2. Note that the x axis is a logarithmic scale
