Power and sample size calculations: A review and computer program☆
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This research was supported in part by NIH grants and contracts HL-14192, N01-AI-52593, R01-CA40517, and R01-CA46492.
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We thank Robert A. Parker, George W. Reed, Gordon R. Bernard, Curtis L. Meinert, and the referees for helpful advice, and Janelle Steele and Virginia McKinney for assistance in preparing this manuscript.
Copyright © 1990 Published by Elsevier Inc.