Before revision:  Comparing our results with findings from local seroprevalence studies and applying our bias formulas shows that some of their infection estimates would only be possible if just a small fraction of COVID-19 related deaths were recorded, indicating that these seroprevalence estimates might not be representative for the total population.
After revision:  Comparing our results with findings from local seroprevalence studies . We introduce formulas for quantifying the bias that is required in our data on deaths in order to reproduce estimates published elsewhere. This bias analysis shows that either COVID-19 related deaths were recorded, indicating that these seroprevalence estimates might not be representative for the total population.