1. From the Departments of Internal Medicine (R.E.G.S., D.H.B.), Clinical Chemistry (F.J.L.M.H.), and Research and Development (J.C.K.), St Antonius Hospital, Nieuwegein; the Department of Internal Medicine (P.A., A.H.P.), Diakonessenhuis, Utrecht; the Department of Hematology (H.K.N.), University Medical Centre, Utrecht; the Department of Internal Medicine (H.G.P., M.P.), Groene Hart Hospital, Gouda; and the Department of Internal Medicine (R.O.), Mesos Medical Centre, Utrecht, the Netherlands.