Letter: A pitfall in the shake test on gastric aspirate.

@article{Gebhardt1976LetterAP,
  title={Letter: A pitfall in the shake test on gastric aspirate.},
  author={David O E Gebhardt and J. H. J. Ruys},
  journal={The New England journal of medicine},
  year={1976},
  volume={294 4},
  pages={225}
}