@article{klein_2012,  title={Panic Developments},  volume={34},  ISSN={1516-4446},  url={https://doi.org/10.1590/S1516-44462012000500001},  DOI={10.1590/S1516-44462012000500001},  journal={Brazilian Journal of Psychiatry},  publisher={Associação Brasileira de Psiquiatria},  author={Klein, Donald F.},  year={2012},  month={Jun},  pages={1–2} }