title: Methodological difficulties in hand hygiene research.
authors: M
authors: M
authors: Whitby
authors: M-L
authors: ML
authors: McLaws
mesh_terms: D003299:Cooperative Behavior; D003428:Cross Infection / Q000517:prevention & control*; D019983:Guideline Adherence; D006235:Hand Disinfection; D006801:Humans