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This work uses data from Add Health, a program project designed by<br>Udry,Richard J. Bearman, Peter S. & Harris, Kathleen Mullan, and funded by a<br>grant P01-HD31921 from the National Institute of Child Health and Human<br>Development, with cooperative funding from 17 other agencies. Special<br>acknowledgment is due Ronald R. Rindfuss and Barbara Entwisle for assistance<br>in the original design. Persons interested in obtaining data files from Add<br>Health should contact Add Health, Carolina Population Center, 123 W. Franklin<br>Street, Chapel Hill, NC 27516–2524 (addhealth@unc.edu).
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Xianchao Tang创建时间：
2014-08-24
