Response to letter to editor "Pulmonary toxicity in rats following inhalation exposure to poorly soluble particles of low toxicity: Testing at excessive concentrations overwhelming lung clearance"?
1 National Institute for Public Health and the Environment, Bilthoven, the Netherlands. Electronic address: peter.bos@rivm.nl.
2 National Institute for Public Health and the Environment, Bilthoven, the Netherlands. Electronic address: ilse.gosens@rivm.nl.
3 National Institute for Public Health and the Environment, Bilthoven, the Netherlands. Electronic address: liesbeth.geraets@rivm.nl.
4 National Institute for Public Health and the Environment, Bilthoven, the Netherlands. Electronic address: Christiaan.Delmaar@rivm.nl.
5 National Institute for Public Health and the Environment, Bilthoven, the Netherlands; Institute for Risk Assessment Sciences, Utrecht University, Utrecht, the Netherlands. Electronic address: Flemming.Cassee@rivm.nl.