Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Longitudinal Study of Aging Danish Twins, 1995 (ICPSR 21041) Christensen, Kaare; Vaupel, James W. 2. Danish 1905 Cohort Study, 1998 (ICPSR 3960) University of Southern Denmark. Institute of Public Health; Duke University 3. World Health Organization Regional Office for Southeast Asia Collaborative Study on Social and Health Aspects of Aging in Burma, Indonesia, North Korea, Sri Lanka, and Thailand, 1990 (ICPSR 6242) Andrews, Gary R.