2.2. Participants
allergic symptoms, gastrointestinal tract
MEDICATION ALLERGY, DISEASE, FOOD ALLERGY
Participants were included if they were between the ages of 20 and 74 years. Participants with one or more of the following criteria were excluded from participation: (1) disease or serious medical history of the liver, kidney, heart, lung, gastrointestinal tract, blood, endocrine system or metabolism; (2) regular use of oral or nasal medications; (3) serious medication allergy, food allergy or history of any of these; (4) severe perennial or seasonal allergic symptoms; (5) plans to be vaccinated against COVID-19 from two weeks before the start of this study to the end of the study time when written consent was obtained; (6) pregnancy, lactation or expectation to be pregnant during this study; (7) participation in another study within 1 month prior to giving informed consent; and (8) any other reason making participation inappropriate as deemed by the principal investigator based on patient background and physical examination.