Right upper lung lobe samples were fixed in formaldehyde (Biopsafe), embedded in paraffin and cut in 5‐μm sections that were stained with haematoxylin‐eosin for microscopic observation (Nikon Instruments Inc.). Four distinct sections of each tissue block were used to determine the damaged area as percentage of the total lung area using the NISElements D version 3.0x software package (Nikon Instruments Inc.).
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