title: Gender differences.
authors.forename: E C
authors.initials: EC
authors.lastname: Ritchie
authors.forename: K C
authors.initials: KC
authors.lastname: Hyams
mesh_terms: D005260:Female; D006772:Hospitals, Military / Q000706:statistics & numerical data*; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D008887:Military Medicine / Q000706:statistics & numerical data*