@article\{Patel2015,
 author={Chirag J. Patel and  Belinda Burford and  John P. A. Ioannidis},
 title={{Assessment of vibration of effects due to model specification can demonstrate theinstability of observational associations}},
 journal={Journal of clinical epidemiology},
 volume={68},
 number={9},
 pages={1046--1048},
 year={2015}
}