[1] Agr Res Council, Onderstepoort Vet Inst, Toxicol & Ethnovet Med Food Feed & Vet Publ Hlth, Private Bag X05, ZA-0110 Onderstepoort, South Africa
[2] Univ Pretoria, Dept Paraclin Sci, Private Bag X04, ZA-0110 Onderstepoort, South Africa
[3] Univ Antwerp, Dept Pharmaceut Sci, B-2610 Antwerp, Belgium
[4] Sci Inst Publ Hlth, Lab Toxicol, OD Publ Hlth & Surveillance, Rue Juliet Wytsmanstr 14, B-1050 Brussels, Belgium
[5] Univ Antwerp, Dept Biomed Sci, B-2610 Antwerp, Belgium