AMERICAN VETERANS; CONTROL GROUP; CUSTOMS DEPT; DANES; DANISH CANCER SOCIETY; DANISH FIRE PROTECTION ASSN; DANISH HEALTH BOARD; DANISH HEALTH PANEL; DANISH MEDICAL ASSN; DANSKERNE; DIAGNOSIS GROUP; FEMALE AGE GROUP; FREDERIKSBORG CTY HOSPITAL; HEALTH BOARD; HEALTH INSURANCE DEPT; HEW, DEPT OF HEALTH EDUCATION AND WELFARE; HHS, DEPT OF HEALTH AND HUMAN SERVICES; HIGH RISK GROUPS; INCOME GROUPS; KAISER PERMANENTE; LANDSPATIENTREGISTRET; LOW RISK GROUPS; NORTHWEST; OBSERVA; OCCUPATIONAL GROUPS; OLDER AGE GROUPS; POPULATIONS GROUPS; ROYAL COLLEGE OF PHYSICIANS; SKANDINAVISK TOBAKSKOMPAGNI; TOBAKSKOMPAGNIET; UN, UNITED NATIONS; UNIV OF ODENSE; WORKING GROUP; YOUNG AGE GROUPS