In Germany a finished medicine may only be sold with a package leaflet in German. The manufacturer must list all known side effects, sorted into fixed frequency classes. The wording runs from sehr häufig, very common, to sehr selten, very rare. A common class reads: Häufig (kann bis zu 1 von 10 Behandelten betreffen), common, may affect up to 1 in 10 people treated. The result is the long folded Beipackzettel that Germans find in every box. A health scientist at the University of Hamburg writes that the leaflets sind juristische Dokumente zur Absicherung der Hersteller, keine Patienteninformationen. They are legal documents that protect the manufacturer, not information for patients.