1 Centro Pediatrico del Mendrisiotto, Mendrisio, Switzerland.
2 Adverse Drug Reactions - Analysis and Consulting, Bern, Switzerland.
3 Pediatric Allergy Unit, Department of Woman, Child, and Adolescent, University Hospitals of Geneva, Geneva, Switzerland.
4 Centro Pediatrico del Mendrisiotto, Mendrisio, Switzerland; Pediatric Allergy Unit, Department of Woman, Child, and Adolescent, University Hospitals of Geneva, Geneva, Switzerland; Faculty of Biomedical Science, Università della Svizzera Italiana (USI), Lugano, Switzerland. Electronic address: marcel.bergmann@centropediatrico.ch.