Figure 1. Location of participating units and number of paediatric cases reported by country

82 participating units are shown; cities with more than one participating unit are represented by a single dot only (London [four units], Antwerp [n=3], Madrid [n=3], Vienna [n=3], Barcelona [n=2], Berlin [n=2], Girona [n=2], Manchester [n=2], Rome [n=2], Tallinn [n=2], and Zagreb [n=2]).