Bibliographical noteFunding Information:
Acknowledgments. This work was supported by the Incentive Programme "Health Hazards" of the Federal Office for Scientific Cultural and Technical Matters" of the Belgian State. P.V. is indebted to the National Fund for Scientific Research (Belgium) for a position of senior research associate. We thank Prof. A. Huyghebaert and Ir. H. Fierens (University of Ghent, Belgium) for providing some of the bacterial strains and C. Lammens for the technical assistance.
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