In this case, the sampling should be rather large to be more accurate and precise. It is important to determine differences in severity in age, gender, etc. Different countries may have a different severity rate. All these informations are relevant and should be collected from several sources and evaluated by different people to confirm the accuracy. For good sampling one also needs to assess the rate of how many people recover and what is their recovery rate at what age and/or gender. What are different factors that play into the fast or slow recovery from COVID-19.

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