X‐linked protoporphyria: Iron supplementation improves protoporphyrin overload, liver damage and anaemia. (20th July 2015) - Landefeld, Christoph; Kentouche, Karim; Gruhn, Bernd; Stauch, Thomas; Rößler, Steve; Schuppan, Detlef; Whatley, Sharon D.; Beck, James F.; Stölzel, Ulrich