Byung-Kwang Yoo, Megumi Kasajima, Jay Bhattacharya

NBER Working Paper No. 15752
Issued in February 2010

---- Acknowledgments ----

Prof. Yoo's work on this project is supported by National Institute of Health (1K25AI073915). Prof. Bhattacharya's work on this project is supported in part by the National Institute on Aging. We thank Peter G. Szilagyi, MD, MPH and Charles E. Phelps, PhD for their support in conception and Andrea Berry, MS for her data analysis and editing support. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

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