@article{fried2001,
  title={Frailty in Older Adults: Evidence for a Phenotype},
  author={Linda P. Fried and Catherine M. Tangen and Jeremy Walston and Anne B. Newman and Calvin H. Hirsch and John S. Gottdiener and Teresa E. Seeman and Russell P. Tracy and Willem J. Kop and Gregory L. Burke and Mary Ann McBurnie},
  year={2001},
  journal={The Journals of Gerontology Series A},
  doi={10.1093/gerona/56.3.m146},
  url={https://doi.org/10.1093/gerona/56.3.m146}
}