University of Southern California, University of Southern California, University of Southern California, University of California, San Diego (UCSD), University of California, San Diego (UCSD), University of California, San Diego (UCSD), University of Washington, University of Southern California, University of Southern California, University of Southern California, University of Southern California, University of Southern California, University of Southern California, Wake Forest University, Wake Forest University - School of Medicine, University of Southern California - Center for Economic and Social Research (CESR), Government of the United States of America - National Institute on Aging (NIA), affiliation not provided to SSRN, Wake Forest University - School of Medicine, University of Southern California, University of Southern California, University of California, San Diego (UCSD) and affiliation not provided to SSRN