Serum IgG and risk of exacerbations and hospitalizations in chronic obstructive pulmonary disease.

Leitao Filho FS, Won Ra S, Mattman A, Schellenberg RS, Fishbane N, Criner GJ, Woodruff PG, Lazarus SC, Albert R, Connett JE, Han MK, Martinez FJ, Leung JM, Man SFP, Aaron SD, Reed RM, Sin DD