@misc{indiciaed9be69174ddc,
  title = {Tympanomaxillary shunt. Experiences and development.},
  author = {B Drettner and L Ekvall},
  year = {1973},
  doi = {10.3109/00016487309139712},
  url = {https://pubmed.ncbi.nlm.nih.gov/4702616/},
  note = {Source identifier: 4702616}
}