title: Methodological challenges in the evaluation of community interventions.
authors.forename: Alastair H
authors.initials: AH
authors.lastname: Leyland
mesh_terms: D003153:Community Health Services / Q000379:methods* / Q000458:organization & administration; D005069:Evaluation Studies as Topic; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D015983:Selection Bias