Chirurgische Gastroenterologie 2004 ; 20 : 216 – 222</ref><ref>Roth E , Manhart N , Wessner B . Assessing the antioxidative status in critically | Chirurgische Gastroenterologie 2004 ; 20 : 216 – 222</ref><ref>Roth E , Manhart N , Wessner B . Assessing the antioxidative status in critically |