RT Journal Article SR Electronic T1 Basic concepts in population health and health care JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 452 OP 454 DO 10.1136/jech.55.7.452 VO 55 IS 7 A1 B Starfield YR 2001 UL http://jech.bmj.com/content/55/7/452.abstract AB