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Connie M. Ulrich, Gwenyth R. Wallen, Autumn Feister, Christine Grady, Respondent Burden in Clinical Research: When Are We Asking Too Much of Subjects?, IRB: Ethics & Human Research, Vol. 27, No. 4 (Jul. - Aug., 2005), pp. 17-20
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Ulrich et al. (2005) studied this question.
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