1. From the Divisions of Clinical Chemistry (S.v.B., U.D., I.B.), Orthopedics (T.M.), Pathology (N.P.), and Lung Medicine (P.R.), Karolinska Institutet, Huddinge University Hospital, Stockholm, Sweden; and Department of Pharmacology and Toxicology (I.P.), University of Texas Medical Branch, Galvestone, Tex.