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. 2022 Apr 6;181(7):2663–2671. doi: 10.1007/s00431-022-04457-0

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© The Author(s) 2022, corrected publication 2022

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Fig. 1 — Italian provinces with at least one unit invited: in grey color those with at least one participant center, in light gray color those without any participating unit. We were not able to invite any unit in two provinces (dark gray color)