*
Corresponding authors
a
Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, USA
E-mail:
Stephen.Reynolds@Colostate.edu
Fax: +1 970-491-2940
b
Department of Environmental Health, Harvard School of Public Health, 665 Huntington Ave, Boston, USA
c
Institute for Risk Assessment Sciences (IRAS), Division of Environmental and Occupational Health, University of Utrecht, PO Box 80176, Utrecht, The Netherlands
d
College of Public Health, Department of Occupational and Environmental Health, The University of Iowa, Iowa City, USA
e
Division of Respiratory Disease Studies/NIOSH, 1095 Willowdale Road, Morgantown, USA
f
Bendigo Agricultural Centre, Bendigo Mail Centre, Victoria, Australia
g
National Institute for Working Life, Stockholm, Sweden
h
Department of Mathematical Sciences, University of Cincinnati, Cincinnati, USA
i
Department of Laboratory Medicine, Section of Medical Microbiology, University of Lund, Sölvegatan 23, Lund, Sweden