Levels and enantiomeric signatures of methyl sulfonyl PCB and DDE metabolites in livers of harbor porpoises (Phocoena phocoena) from the Southern North sea - Blust, Ronny.; Bouquegneau, Jean-Marie.; Chu, Shaogang.; Coen, Wim De.; Covaci, Adrian.; Das, Krishna.; Haraguchi, Koichi.; Schepens, Paul.; Vijver, Kristin Van de.; Voorspoels, Stefan.