1. Department Environment and Agro-biotechnologies, Centre de Recherche Public—Gabriel Lippmann, 41, rue du Brill, L-4422 Belvaux, Grand-duchy of Luxembourg, National Veterinary Institute, Postboks 750 Sentrum, NO-0106 Oslo, Norway, Institute for Environmental Studies, VU University Amsterdam, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands, Norwegian School of Veterinary Science, P.O. Box 8146 Dep., NO-0033 Oslo, Norway, Department of Environmental Chemistry, Stockholm University, SE-106 91 Stockholm...