Sample size and power estimation for studies with health related quality of life outcomes: a comparison of four methods using the SF-36
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Correspondence: Stephen J Walters s.j.walters@shef.ac.uk
Health and Quality of Life Outcomes 2004, 2:26 doi:10.1186/1477-7525-2-26
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Stephen J Walters, Michael J Campbell Health and Quality of Life Outcomes 2004, 2:70 (9 December 2004) |