** Corresponding author:
Narissara Suratannon
Pediatric Allergy and Clinical Immunology Research Unit, Division of Allergy and Immunology, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, The Thai Red Cross Society
1873 Rama IV Rd, Pathum Wan, Bangkok 10330, Thailand
E-mail: narissara.su@chula.ac.th
Word count: 2498 words; 2 Figures; 4 Tables
Material in the electronic repository: additional Methods section
Conflict of Interest: All authors have no relevant financial relationships to disclose.
Financial support : This study was supported by Ratchadapisek Research Funds (Grant No. CU-GR(S)_61_38_30_03), Chulalongkorn University, Bankgok, Thailand and Thrasher Research Fund.