"The project that is the subject of this report is supported by Contract SES-9709489 between the National Academy of Sciences and the U.S. Department of Labor and the National Institute of Aging"--T.p. verso
Includes bibliographical references (p. 63-65)
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries