Levels of organochlorinated pesticide residues and other persistent organic pollutants in breast milk: the Belgian results from the 6th WHO-coordinated survey, Van Overmeire, Ilse, Joly Laure, Malarvannan G., Poma G., Covaci A., Colles A., Koppen G., Den Hond E., Van de Mieroop E., De Wolf M.C., et al. , International symposium on halogenated Persistent Organic Pollutants (POPs) DIOXIN 2018, 2018, (2018)