title: De facto masking and other measures to prevent contamination.
authors.forename: Vance W
authors.initials: VW
authors.lastname: Berger
mesh_terms: D006801:Humans; D007258:Informed Consent / Q000941:ethics*; D008019:Life Style; D009369:Neoplasms / Q000628:therapy*; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design; D035842:Research Subjects / Q000523:psychology*