[1] Siriraj Hosp, Fac Med, Ctr Res Excellence Allergy & Immunol, Bangkok, Thailand
[2] Prince Songkla Univ, Fac Med, Dept Pathol, Hat Yai, Thailand
[3] Mahidol Univ, Fac Med, Dept Otorhinolaryngol, Siriraj Hosp, Bangkok, Thailand
[4] Queen Sirikit Natl Inst Child Hlth, Bangkok, Thailand
[5] Khon Kaen Univ, Fac Med, Dept Otorhinolaryngol, Khon Kaen, Thailand
[6] Chulalongkorn Univ, Dept Otolaryngol, Bangkok, Thailand