Before revision:  Although the COVID-19 outbreak started almost in the same period, at the beginning of 2020, in both north (Lombardia and Veneto) and central part of Italy (Lazio)  , when the first infected were officially certified , the outbreak has been more diffuse and lethal only in those regions with higher epidemic risk.
After revision:  Although the COVID-19 outbreak started almost in the same period, at the beginning of 2020, in both north (Lombardia and Veneto) and central part of Italy (Lazio) almost at the same time , when the first infected were officially certified , the outbreak has been more diffuse and lethal only in those regions with higher epidemic risk.