RT Journal Article SR Electronic T1 What is a public health observatory? JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 324 OP 326 DO 10.1136/jech.57.5.324 VO 57 IS 5 A1 J Hemmings A1 J Wilkinson YR 2003 UL http://jech.bmj.com/content/57/5/324.abstract AB