Bahl, P., Doolan, C., de Silva, C., Chughtai, A. A., Bourouiba, L. and MacIntyre, C. R. (2020) Airborne or Droplet Precautions for Health Workers Treating Coronavirus Disease 2019? The Journal of Infectious Diseases, jiaa189, https://doi.org/10.1093/infdis/jiaa189