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3. Prevalence of chronic leg ulceration and severe chronic venous disease in western countries;Callam;Phlebology,1992
4. Prävalenz, Risikofaktoren und Komplikationen periphere Venenerkrankungen in der Münchner Bevölkerung;Eberth-Willershausen;Der Hautarzt,1984
5. Venous ulceration;Browse;Br Med J,1983