References
  1. Good Practice for Surgeons and Surgical Teams. Royal College of Surgeons of England. April 2020. P13-15
  2. Grote H (2020) Read my lips; the downside of PPE (and how you can improve communication). Royal College of Physicians News. May 2020. Website; https://www.rcplondon.ac.uk/news/read-my-lips-downside-ppe-and-how-you-can-improve-communication accessed 8/7/2020