[1] Univ Vermont, Burlington, VT 05405 USA
[2] Univ Genoa, Genoa, Italy
[3] Harvard Univ, Boston, MA 02138 USA
[4] McGill Univ, Montreal, PQ, Canada
[5] Univ Szeged, Szeged, Hungary
[6] Univ Kentucky, Lexington, KY USA
[7] Univ Chicago, Chicago, IL 60637 USA
[8] Boston Univ, Boston, MA 02215 USA
[9] Johns Hopkins Univ, Baltimore, MD 21218 USA
[10] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[11] Natl Heart & Lung Inst, London, England
[12] Univ Western Australia, Perth, WA 6009, Australia