Sex and gender differences in pain: past, present, and future

aCentre for Pain Research, University of Bath, Bath, United Kingdom bDepartment of Psychology, University of Bath, Bath, United Kingdom Address: Department of Psychology, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom. Tel.: +44(0)1225 383671; fax: +44(0)1225 386752. E-mail address: [email protected] (E. Keogh). Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.