Can you give me a citation on the "10% of the milder COVID cases still are not recovered after 6 months"? I haven't found any good studies on this, and the "milder" in your sentence implies that you not only found research, but you found research that breaks it down by infection severity.
My google fu is failing me when I search for it though, so I would very much appreciate a link.
"Epidemiologische Studien zeigen, dass etwa zehn Prozent der ambulanten Patienten nach sechs Monaten unter Long Covid leiden. Von diesen Patienten sind wiederum zehn Prozent vom chronischen Fatigue-Syndrom betroffen, schätzen Wissenschaftler. "
My google fu is failing me when I search for it though, so I would very much appreciate a link.