PT - JOURNAL ARTICLE AU - G D Smith AU - A Phillips TI - Declaring independence: why we should be cautious. AID - 10.1136/jech.44.4.257 DP - 1990 Dec 01 TA - Journal of Epidemiology and Community Health PG - 257--258 VI - 44 IP - 4 4099 - http://jech.bmj.com/content/44/4/257.short 4100 - http://jech.bmj.com/content/44/4/257.full SO - J Epidemiol Community Health1990 Dec 01; 44