Chronic obstructive pulmonary disease.
Nichol
K L
KL
D006801:Humans; D007252:Influenza Vaccines; D008173:Lung Diseases, Obstructive / Q000517:prevention & control*; D022242:Pneumococcal Vaccines; D014611:Vaccination
D007252:Influenza Vaccines; D022242:Pneumococcal Vaccines