RT Journal Article SR Electronic T1 Measuring national health. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1 OP 2 DO 10.1136/jech.44.1.1 VO 44 IS 1 YR 1990 UL http://jech.bmj.com/content/44/1/1.abstract AB