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Blinding was judged more difficult to achieve and maintain in nonpharmacologic than pharmacologic trials.
Source: J Clin Epidemiol. 2004 Jun;57(6):543-50. DOI: 10.1016/j.jclinepi.2003.12.010 Language: English Availability: abstract -
A single blind randomized, controlled trial of hydrotherapy for varicose veins.
Source: Vasa. 1991;20(2):147-52. DOI: Not specified Language: English Availability: abstract