RT Journal Article SR Electronic T1 Statistical analysis of epidemiologic data, 3rd ed JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1007 OP 1007 VO 59 IS 11 A1 M Delgado-Rodriguez YR 2005 UL http://jech.bmj.com/content/59/11/1007.1.abstract AB