Chronic obstructive pulmonary disease exacerbation frequency and serum IgG levels

We compliment Leitao Filho et al1 for their recent publication titled "Serum immunoglobulin G and risk of exacerbations and hospitalizations in chronic obstructive pulmonary disease." Leitao Filho et al1 make a novel contribution to the understanding of the relationship between baseline serum IgG levels and the frequent chronic obstructive pulmonary disease (COPD) exacerbator phenotype.

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