1 Amsterdam UMC, University of Amsterdam, Coronel Institute of Occupational Health, Netherlands Center for Occupational Diseases, Amsterdam Public Health Research Institute, PO Box 22660, 1100 DD Amsterdam, The Netherlands. h.f.vandermolen@amsterdamumc.nl.
2 Amsterdam UMC, University of Amsterdam, Coronel Institute of Occupational Health, Netherlands Center for Occupational Diseases, Amsterdam Public Health Research Institute, PO Box 22660, 1100 DD Amsterdam, The Netherlands. m.frings@amsterdamumc.nl.