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a: Data of the confirmed infections cases in some Lombardy and Piedmont cities. Data are reported, for each area, starting from the first day of detected infections (generally at the beginning of March 2020) till to 28th March. 1 b: Data of the confirmed infections cases in some Lombardy and Piedmont cities, normalized by inhabitants number. Data correspond to those already shown in Fig. 1a, but they are divided by the population of corresponding area.
