1. Department of Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden, Contaminant Research Group, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden, Institute of Public Health, University of Southern Denmark, DK-5000 Odense, Denmark, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, and Faroese Hospital System, FR-100 Tórshavn, Faroe Islands