title: Use of company stock ownership records to locate subjects lost to follow-up.
abstract: When 10,766 members of a refinery retrospective cohort study were assessed for vital status using conventional company and Social Security Administration records, the status of 370 remained unknown. Computerized corporate files of shareholder information yielded current addresses for 243 of those lost to follow-up, and through Directory Assistance, telephone numbers were obtained for 152. Vital status was ascertained by telephone for 146 of the 370 members of the cohort whose status had been unknown.
mesh_terms: D003201:Computers; D003625:Data Collection / Q000379:methods*; D005500:Follow-Up Studies; D006801:Humans; D007449:Investments; D009784:Occupational Diseases / Q000401:mortality*; D010578:Petroleum; D011996:Records; D012189:Retrospective Studies; D014798:Vital Statistics
chemical_list: D010578:Petroleum