1. Gordon D. Brown is a professor at the Aberdeen Fungal Group, Institute of Medical Sciences, University of Aberdeen, AB25 2ZD, UK.
2. David W. Denning is a professor at the University of Manchester and director of the National Aspergillosis Centre, University Hospital of South Manchester, Manchester, M23 9LT, UK.
3. Stuart M. Levitz is a professor in the Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.