Complexity and the Hawthorne effect in community trials.
Grufferman
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D015982:Bias; D002656:Child Day Care Centers; D002675:Child, Preschool; D002986:Clinical Trials as Topic / Q000592:standards*; D015987:Effect Modifier, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans; D017053:Infection Control / Q000379:methods; D012107:Research Design / Q000592:standards*