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Received from the Division of Biometry and Medical Informatics, Department of Community and Family Medicine, Duke University Medical Center, Durham, North Carolina. Address correspondence to Dr. Smith, Box 3391, Duke University Medical Center, Durham, NC 27710. The author thanks J. G. Reves, MD, F. E. Harrell Jr., PhD, W. D. White, MPH, and B. M. Lovell, MA for their critical review of the manuscript. Accepted for publication November 15, 1989.
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Leanne Smith (1990) studied this question.
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