TY - JOUR A1 - Hammarström, A. A1 - Annandale, E. T1 - A conceptual muddle: An empirical analysis of the use of ‘sex’ and ‘gender’ in ‘gender-specific medicine’ journals Y1 - 2012 DO - 10.1371/journal.pone.0034193 VL - 7 IS - 4 ER -