Burdon KP, Bento JL, Langefeld CD, Campbell JK, Carr JJ, Wagenknecht LM, Herrington DM, Freedman BI, Rich SS, Bowden DW. Association of protein tyrosine phosphatase-N1 polymorphisms with coronary calcified plaque in the Diabetes Heart Study. Diabetes. 2006 Mar; 55(3):651-8.