[1] Tech Univ Munich, ZAUM Ctr Allergy & Environm, Div Environm Dermatol & Allergy GSF TUM, D-8000 Munich, Germany
[2] GSF Natl Res Ctr Environm & Hlth, Inst Inhalat Biol, GSF Focus Aerosols & Hlth, Neuherberg, Germany
[3] Natl Inst Publ Hlth & Environm, Ctr Environm Hlth Res, Dept Tox Effects Air Pollut, NL-3720 BA Bilthoven, Netherlands