1. Department of Movement, Human and Health Sciences, Public Health Unit, University of Rome ‘Foro Italico’, P.zza L. De Bosis 6, Roma, Italy
2. Département Climatologie – Aérodynamique – Pollution – Epuration, Centre Scientifique et Technique du Bâtiment, 11 rue Henri Picherit, Nantes cedex 3, France
3. Federal Office of Public Health, Division of Chemical Products, Post Box 3003 Bern, Switzerland
4. Department für Infektiologie, Hygiene und Med. Mikrobiologie, Chemielabor, Im Neuenheimer Feld 324, Heidelberg, Germany