%0 Journal Article %T Increased gamma-glutamyl transferase level is associated with absence of coronary collateral vessels in patients with acute coronary syndrome: an observational study %A Duran, M. %A Günebakmaz, Ö. %A Kadir Uysal, O. %A Çelik, A. %A Yarlioglues, M. %A Karakaya, E. %J The Anatolian Journal of Cardiology %D 2012 %V 12 %P 652-658 %R 10.5152/akd.2012.217