"There is no one who helps you with it": experiences of people with long COVID regarding medical care, therapeutic measures, and barriers in the German healthcare system: results of a qualitative study with four focus groups. - Schmachtenberg, Tim; Königs, Gloria; Dragaqina, Anita; Roder, Sascha; Müller, Frank; Müllenmeister, Christina; Schröder, Dominik; Dopfer-Jablonka, Alexandra; Vieth, Katharina; El-Sayed, Iman (BMC Health Services Research, 2023)