1. From the Department of Medical Biochemistry, University of Tampere Medical School (T.L., S.L., O.J., T.N.), Department of Clinical Chemistry, Tampere University Hospital (T.L., S.L., T.S., H.J., T.K.), Department of Internal Medicine, Tampere City Hospital (M.N.), Tampere; and the A. I. Virtanen Institute (J.S.L., S.Y.-H.) and Department of Medicine (S.Y., J.S.L.), University of Kuopio, Kuopio, Finland.