Patients that had answered the first questionnaire were invited to a study visit. At this visit, they signed a written informed consent document and were examined by a doctor (SP). The severity of AE was evaluated by using the SCORAD calculator. 18 We performed flow‐volume spirometry to assess lung function by using Medikro Pro equipment (Medikro Oy, Kuopio, Finland). Measurements were both pre‐ and post‐bronchodilation, which was attained by administering salbutamol (0.4 mg). The following spirometry values were analysed: forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and FEV1/FVC. Analysis and reporting of results were based on percentages of predicted values adjusted for age, sex and height.
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