**2.4 Participants**

Study participants are recruited by direct invitation and pamphlets from pediatric allergy-immunology clinic at Dr. Soetomo General Hospital (Indonesia). Data collectors reviewed the clinic appointment schedules to identify subjects with HDM allergy and met with subjects and their parents or families after their physician visit for a screening to assess their eligibility. Patients were enrolled after considering various inclusion and exclusion criteria such as mentioned in (**Table 1**). By total sampling, 32 subjects were obtained from this hospital. They were prescreened from January 31 to February 28, 2017 at pediatric allergyimmunology clinic at Dr. Soetomo General Hospital (Indonesia). Based on the inclusion and exclusion criteria mentioned in (**Table 1**), 22 subjects were eligible to participate in the study. Informed consent is given as a voluntary agreement to participate in this research, out of which, 20 parents agreed and 2 parents declined to participate in the study.
