1. From the Research Centre of Applied and Preventive Cardiovascular Medicine (K.K., M.S., I.V., T.K.), and the Departments of Clinical Physiology (O.T.R.), Medicine (J.V., T.R.), and Pediatrics (O.S.), University of Turku, Turku, Finland; Department of Pediatrics (E.J.), University of Helsinki, Helsinki, Finland; and Joint Clinical Biochemistry Laboratory of University of Turku, Turku University Central Hospital and Wallac Oy (M.H.), Turku, Finland.