@article{iacobucci_2021, 
  title={Covid-19: Fever, chills, and aches more common when AstraZeneca and Pfizer vaccines are mixed, early data show}, 
  volume={373}, 
  DOI={10.1136/bmj.n1216}, 
  publisher={BMJ}, 
  author={Iacobucci, Gareth}, 
  year={2021}, 
  month={May}
  }