RT Journal Article SR Electronic T1 Hospital beds JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 241 OP 241 DO 10.1136/jech.56.4.241-a VO 56 IS 4 A1 John R Ashton YR 2002 UL http://jech.bmj.com/content/56/4/241.2.abstract AB