Improving the care of people affected by post-COVID syndrome (LCovB):study protocol of a mixed-methods study. - Burchardi, Jennifer Marie; Brünger, Martin; Freitag, Helma; Brock, Anna; Scheibenbogen, Carmen; Kohzer, Natalie; Kexel, Ellen; Kohl, Raphael; Rückgauer, Lea; Schmitz, Eva; Budnick, Andrea; Schuster, Johanna (PLoS ONE, 2026)