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- [2] CASE-CONTROL STUDY AND RETROSPECTIVE CONTROLS BMJ-BRITISH MEDICAL JOURNAL, 1979, 2 (6203): : 1507 - 1507
- [3] CASE-CONTROL STUDY AND RETROSPECTIVE CONTROLS BRITISH MEDICAL JOURNAL, 1979, 2 (6203): : 1507 - 1508
- [5] LOGISTICS OF SELECTING COMMUNITY CONTROLS FOR A CASE-CONTROL STUDY OF SMOKING AND INFLAMMATORY BOWEL-DISEASE CLINICAL RESEARCH, 1985, 33 (02): : A265 - A265