TY - GEN AU - Angell,M TI - The interpretation of epidemiologic studies SN - 0028-4793 PY - 1990///1003 KW - Child KW - Cystic Fibrosis KW - physiopathology KW - Epidemiologic Methods KW - Humans KW - Risk Factors KW - Tobacco Smoke Pollution KW - adverse effects N1 - Publication Type: Comment; Editorial UR - https://doi.org/10.1056/NEJM199009203231209 ER -