1. From the Institute of Biomedicine/Anatomy (T.B., N.B., A.-L.M., E.I.), University of Helsinki, Finland; Department of Chemistry and Biochemistry (R.B., Z.L.), Queens College, City University of New York, Flushing; Organic Chemistry Department (A.d.L.), Universidade de Vigo, Vigo, Spain; Wihuri Research Institute (P.T.K.), Helsinki, Finland; and Department of Laboratory Medicine (U.D.), Division of Clinical Chemistry, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.