Fig. 1From: The value of bronchodilator response in FEV1 and FeNO for differentiating between chronic respiratory diseases: an observational studyStudy flowchart. BDT, bronchodilation test; FeNO, fractional exhaled nitric oxide; GINA, Global Initiative for Asthma; GOLD, Global Initiative for Chronic Obstructive Lung Disease; COPD, chronic obstructive pulmonary disease; ACO, asthma–chronic obstructive pulmonary disease overlapBack to article page