Before revision:  It is shown that the quantity that can be the most robustly estimated from the normalized data, is the timing of the maximum and timings of the inflection points of the proportion of infected individuals  .
After revision:  It is shown that the quantity that can be the most robustly estimated from the normalized data, is the timing of the maximum and timings of the inflection points of the proportion of infected individuals can be robustly estimated from the normalized data. The validation of the estimates by comparing the predictions with actual data has shown that the predictions were realised for all countries except USA, as long as lock-down measures were retained .