Arch Toxicol (2006) DOI 10.1007/s00204-006-0061-9

One of the references cited in the text for this manuscript was missing. The additional reference is:

Clewell HJ, Gentry PR, Kester JE, Andersen ME (2005) Evaluation of physiologically based pharmacokinetic models in risk assessment: an example with perchloroethylene. Crit Rev Toxicol 35:413–433