RT Journal Article SR Electronic T1 Leukaemia risk and social contact in children aged 0-4 years in southern England. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 601 OP 602 DO 10.1136/jech.48.6.601 VO 48 IS 6 A1 Roman, E A1 Watson, A A1 Bull, D A1 Baker, K YR 1994 UL http://jech.bmj.com/content/48/6/601.abstract AB