Care for post-COVID-19 condition in Germany from the perspectives of patients, informal caregivers and general practitioners: Study protocol for a mixed methods study. - Brinkmann, Melanie; Stolz, Maike; Herr, Annika; Herrmann-Lingen, Christoph; Koch, Imke; Müller, Christiane; Müller, Frank; Sekanina, Uta; Stahmeyer, Jona Theodor; de Zwaan, Martina; Krauth, Christian; Schneider, Nils (PLoS ONE, 2024)