Subungual exostoses of the fingers. Are they really uncommon?

@article{Matthewson1978SubungualEO,
  title={Subungual exostoses of the fingers. Are they really uncommon?},
  author={Mandy Matthewson},
  journal={The British journal of dermatology},
  year={1978},
  volume={98 2},
  pages={187-9}
}