Of the total sample (N = 2,174), we were able to determine the vital status of 1,313 (60%) individuals; 789 (36%) were alive and contacted, and 524 (24%) were confirmed deceased. Most of the remaining 861 (40%) subjects were likely to be alive (since relatives, Internet websites, and a comprehensive NDI search failed to identify any of them as deceased), but had not yet been contacted by the end of the one-year active study period (Figure 2).
