[1] Clin Arauco, Jefe Unidad Otorrinolaringol, Santiago, Chile
[2] Monash Med Ctr, Dept Resp & Sleep Med, Clayton, Vic 3168, Australia
[3] Univ Amsterdam, Acad Med Ctr, Div Neurozintuigspecialsmen, NL-1105 AZ Amsterdam, Netherlands
[4] GlaxoSmithKline Inc, Greenford, Middx, England
[5] GlaxoSmithKline Inc, Resp MDC, Res Triangle Pk, NC USA