DACH‐LIGA homocystein (german, austrian and swiss homocysteine society): consensus paper on the rational clinical use of homocysteine, folic acid and B‐vitamins in cardiovascular and thrombotic diseases: guidelines and recommendations. - Stanger,O.; Herrmann,W.; Pietrzik,K.; Fowler,B.; Geisel,J.; Dierkes,J.; Weger,M. (Clin Chem Lab Med, 2003)