@misc{indiciaedf1897205f90,
  title = {Gain usage based on hearing aid experience and subject age.},
  author = {K W Berger and E N Hagberg},
  doi = {10.1097/00003446-198207000-00009},
  url = {https://pubmed.ncbi.nlm.nih.gov/7117721/},
  note = {Source identifier: 7117721}
}