@misc{indiciaecc320ee7143f,
  title = {Chronic bronchitis in North India.},
  author = {S K Malik},
  year = {1977},
  doi = {10.1378/chest.72.6.800},
  url = {https://pubmed.ncbi.nlm.nih.gov/923324/},
  note = {Source identifier: 923324}
}