1. Department of Dermatology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
2. Department of Otolaryngology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
3. Section of Allergy and Immunology, Department of Pediatrics, University of the Philippines-Philippine General Hospital, Manila, Philippines.
4. Department of Dermatology, Research Institute for Tropical Medicine, Manila, Philippines.
5. Department of General Medicine, Sengkang Health, Singapore.
6. Department of Otorhinolaringology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.
7. Private Clinic, Hong Kong.
8. ASCENT Ear Nose Throat Specialist Group, Singapore.
9. Foong Skin Specialist Clinic, Ipoh, Malaysia.
10. National Hospital of Otorhinolaryngology, Hanoi, Vietnam.
11. Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology and Allergy, Allergy-Centre-Charité, Berlin, Germany.