[1] Univ Hosp Leuven, Dept Internal Med, B-3000 Louvain, Belgium
[2] Univ Saskatchewan, Coll Med, Saskatoon, SK S7N 0W0, Canada
[3] Moose Jaw Union Hosp, Dept Emergency Med, Moose Jaw, SK, Canada
[4] Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Obstet Gynecol & Reprod Sci, New Brunswick, NJ USA
[5] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[6] Poole Gen Hosp, Dept Resp Med, Poole, Dorset, England
[7] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Dept Internal Med, Boston, MA USA
[8] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Dept Pediat, Boston, MA USA
[9] Walsall Manor Hosp, Walsall, W Midlands, England
[10] Univ Vermont, Coll Med, Burlington, VT USA
[11] Royal Brisbane & Womens Hosp, Dept Anat Pathol, Brisbane, Qld, Australia
[12] Univ Queensland, Sch Med, Div Cellular & Mol Pathol, Brisbane, Qld, Australia
[13] Univ Illinois, Dept Dermatol, Chicago, IL USA
[14] Leiden Univ, Med Ctr, Dept Radiol, Leiden, Netherlands
[15] Rush Univ, Coll Med, Chicago, IL 60612 USA
[16] Univ Toronto, Dept Cardiac Surg, Toronto, ON, Canada
[17] Univ Colorado, Sch Med, Dept Immunol, Denver, CO USA
[18] Univ Coll Hosp, Dept Acute Med, London, England
[19] Bankstown Hlth Serv, Dept Psychiat, Sydney, NSW, Australia
[20] Univ New S Wales, Coll Med, Sch Psychiat, Sydney, NSW, Australia
[21] Univ Toronto, Div Gastroenterol, Toronto, ON, Canada
[22] Washington Univ, Sch Med, Dept Mol Microbiol, St Louis, MO 63110 USA
[23] Univ Debrecen, Sch Med, Debrecen, Hungary
[24] Univ Debrecen, Hlth Sci Ctr, Debrecen, Hungary
[25] Univ Colorado, Natl Jewish Hlth, Denver, CO 80202 USA