Aerosol generating procedures: are they of relevance for transmission of SARS-CoV-2?. Issue 7 (July 2021) - Hamilton, Fergus; Arnold, David; Bzdek, Bryan R; Dodd, James; Reid, Jonathan; Maskell, Nick; ,; White, Carrie; Murray, James; Keller, Johannes; Brown, Jules; Shrimpton, Andrew; et al.