1. From the Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Germany (K.F.N., A.T.L., T.A.F., L.M.B., T.R.); and Division of Clinical Chemistry, Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital, Stockholm, Sweden (K.F.N., T.A.F., L.M.B., T.R.).