@misc{indiciae4cb78b0f46b2,
  title = {Acute exacerbations in chronic obstructive pulmonary disease (COPD)--microbial patterns and risk factors.},
  author = {H Schäfer and S Ewig},
  year = {2000},
  url = {https://pubmed.ncbi.nlm.nih.gov/11213381/},
  note = {Source identifier: 11213381}
}