Hemochromatosis (HFE) gene mutations and response to chloroquine in porphyria cutanea tarda. - Stölzel,U.; Köstler,E.; Schuppan,D.; Richter,M.; Wollina,U.; Doss,M.O.; Wittekind,C.; Tannapfel,A. (Arch Dermatol, 2003)