"10.1007/s15006-020-0237-x" . . "MMW Fortschr Med" . "32189286" . . "COVID-19 in der Allgemeinarztpraxis" . "no-cc" . "32189286" . "PMC7101663" . . "2020-03-18"^^ . . . . "Medline; PMC" . . "Bogner, Johannes" . .