Majsiak , Emilia, and Krzysztof Buczyłko. 2016. “Prevalence of Allergen-Specific Immunoglobulin E Against Birch, Alder, Hazel and Oak Among 8254 Patients from Different Regions of Poland”. Alergoprofil 12 (2), 74-78. https://www.journalsmededu.pl/index.php/alergoprofil/article/view/862.