1 National Institute for Public Health and the Environment, 3720 BA Bilthoven, Netherlands; KNCV Tuberculosis Foundation, The Hague, Netherlands. Electronic address: gerard.de.vries@rivm.nl.
2 National Institute for Public Health and the Environment, 3720 BA Bilthoven, Netherlands.
3 National Institute for Public Health and the Environment, 3720 BA Bilthoven, Netherlands; Department of Medical Microbiology, Radboud University Medical Centre, Nijmegen, Netherlands.