@book { QEPQualittszielKatalog,
    title = "QEP® Qualitätsziel-Katalog",
    author = " {}",
    year = "2022",
    publisher = "Deutscher Ärzteverlag",
    address = "Köln, Deutschland",
    url = "https://deutscheraerzteverlag.openpublishing.com/document/1314672"
}