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• Blinding was judged more difficult to achieve and maintain in nonpharmacologic than pharmacologic trials.

  Authors: Boutron I, Tubach F, Giraudeau B, Ravaud P Source: J Clin Epidemiol. 2004 Jun;57(6):543-50. DOI: 10.1016/j.jclinepi.2003.12.010 Language: English Availability: abstract