Baltimore Cochrane Center, University of Maryland School of Medicine, Baltimore, Maryland Correspondence: Kay Dickersin, PhD, Director Baltimore Cochrane Center, Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, 506 West Fayette Street, First Floor, Baltimore, MD 21201; e-mail: [email protected]
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Dickersin et al. (1998) studied this question.
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