Table 2.

Presentation of the main criteria for the inclusion of participants in the study and the justification for the selection of the research group (children 0–5 years old).

Main Criteria for Inclusion	Justification for the Selection of the Test Group
○age 0–5 years	○food allergy is one of the two earliest manifestations of an allergic disease (in the so-called allergy march)
○(optional) episode of acute food allergic reaction: acute urticaria (diagnosis L50)/angioedema (diagnosis T78.3)/anaphylactic shock (diagnosis T78.0)	○food allergies (mainly to cow’s milk proteins) gradually disappear in the following years of life (90% of children grow out of cow’s milk proteins allergy by 5 years of age)
○chronic, recurrent skin lesions (for the last 6 weeks) in the course of atopic dermatitis (diagnosis L20)	○the onset and most frequent occurrence of atopic dermatitis in the first years of life