1. The Wallenberg Laboratory for Cardiovascular Research, Sahlgrenska University Hospital, S-413 45 Göteborg, Sweden, The Department of Clinical Chemistry, University of Göteborg and Sahlgren's Hospital, S-400 33 Göteborg, Sweden, and CJF93/09 INSERM, Faculte des Sciences Pharmaceutiques, Université Francois Rabelais, F-37200 Tours Cedex, France