[1] ALLERGY & ASTHMA RES CTR,OTTAWA,ON,CANADA
[2] CLIN UNIV MT GODINNE,MT GODINNE,YVOIR,BELGIUM
[3] UNIV HOSP,GHENT,BELGIUM
[4] AZ VUB,BRUSSELS,BELGIUM
[5] DROBAK EAR NOSE & THROAT CLIN,DROBAK,NORWAY
[6] MIDLANDS ASTHMA & ALLERGY RES ASSOCIATES,DERBY,ENGLAND
[7] CHU LAVAL,ST FOY,PQ,CANADA
[8] SAHLGRENS UNIV HOSP,DIV ALLERGY,S-41345 GOTHENBURG,SWEDEN
[9] SAHLGRENS UNIV HOSP,ENT DIV,S-41345 GOTHENBURG,SWEDEN
[10] VICTORIA HOSP,LONDON,ON,CANADA
[11] ALLERGOL DIAGNOST CTR,TILBURG,NETHERLANDS
[12] KUOPIO UNIV HOSP,DEPT OTORHINOLARYNGOL,SF-70210 KUOPIO,FINLAND
[13] UNIV BERN,INSELSPITAL,ABT OTORHINOLARYNGOL,CH-3010 BERN,SWITZERLAND
[14] ROYAL INFIRM,LEICESTER,LEICS,ENGLAND
[15] TURKU UNIV,CENT HOSP,DEPT OTORHINOLARYNGOL,TURKU,FINLAND
[16] SCHIELAND HOSP,SCHIEDAM,NETHERLANDS
[17] VANCOUVER GEN HOSP,VANCOUVER,BC,CANADA
[18] ALLERGIECENTRUM AMSTERDAM,AMSTERDAM,NETHERLANDS
[19] SCHERING PLOUGH CORP,RES INST,KENILWORTH,NJ 07033