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History
- August 23, 2016.
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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
Author Information
- 1School of mathematics and scientistics, Central South University;School of Mathematics and Statistics, Central South University, Changsha, China
- 2Center for Population Health and Aging, Duke University, Durham, NC, United States
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