Fig. 2From: Is atopy a risk indicator of chronic obstructive pulmonary disease in dairy farmers?Frequency histogram of specific IgE among dairy-farmers and non-dairy-farmers’ patientsCOPD: chronic obstructive pulmonary disease; DF-COPD: dairy farmers with COPD; DF-control: dairy farmers in control group; NF- COPD: COPD in non-dairy farmers; NF-control: non-dairy farmers in control group.Back to article page