1 Laboratory of Microbiology (LM-UGent), Department of Biochemistry and Microbiology, Ghent University, K.L. Ledeganckstraat 35, B-9000, Ghent, Belgium.
2 Laboratory of Microbiology (LM-UGent), Department of Biochemistry and Microbiology, Ghent University, K.L. Ledeganckstraat 35, B-9000, Ghent, Belgium. Anne.Willems@UGent.be.