Safer Singing During the SARS-CoV-2 Pandemic: What We Know and What We Don't. - Naunheim MR; Bock J; Doucette PA; Hoch M; Howell I; Johns MM; Johnson AM; Krishna P; Meyer D; Milstein CF; Nix J; Pitman MJ; et al. (Journal of voice : official journal of the Voice Foundation, 2021)