Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Chinese Longitudinal Healthy Longevity Survey (CLHLS), 1998-2002 (ICPSR 3891) Yi, Zeng; Vaupel, James W.; Zhenyu, Xiao; et al. 1 more result in Chinese Longitudinal Healthy Longevity Survey (CLHLS) Series 2. Longitudinal Study of Aging Danish Twins, 1995 (ICPSR 21041) Christensen, Kaare; Vaupel, James W.