RT Journal Article SR Electronic T1 The fall of the wall and gender as “natural” experiments JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 81 OP 81 DO 10.1136/jech.54.2.81 VO 54 IS 2 A1 CARLOS ALVAREZ-DARDET YR 2000 UL http://jech.bmj.com/content/54/2/81.abstract AB