Study Search Results Your query returned 2 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded (?) Study Title/Investigator 1. Chinese Longitudinal Healthy Longevity Survey (CLHLS), 1998-2005 (ICPSR 24901) Yi, Zeng; Vaupel, James W.; Zhenyu, Xiao; et al. 2. National Long-Term Care Survey: 1982, 1984, 1989, 1994, 1999, and 2004 (ICPSR 9681) Manton, Kenneth G.