Low toenail chromium concentration and increased risk of nonfatal myocardial infarction. - Guallar,E.; Jimenez,FJ.; Veer,P van’t.; Bode,P.; Riemersma,RA.; Gomez-Aracena,J.; Kark,JD.; Arab,L.; Kok,FJ.; Martin-Moreno,JM. (Am J Epidemiol, 2005)