[1] New York Med Coll, Westchester Med Ctr, Div Infect Dis, Dept Med, Valhalla, NY 10595 USA
[2] Univ Ghent, B-9000 Ghent, Belgium
[3] Royal Natl Throat Nose & Ear Hosp, London WC1X 8DA, England
[4] New York Med Coll, Westchester Med Ctr, Dept Otolaryngol Head & Neck Surg, Valhalla, NY 10595 USA
[5] Univ Illinois, Coll Med, Dept Pediat, Peoria, IL 61656 USA
[6] Univ Calif Irvine, Coll Med, Dept Pediat, Div Allergy & Immunol, Irvine, CA 92717 USA