RT Journal Article SR Electronic T1 A new image for Birmingham JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 112 OP 115 DO 10.1136/tc.7.2.112 VO 7 IS 2 A1 Paul Hooper YR 1998 UL http://tobaccocontrol.bmj.com/content/7/2/112.abstract AB