1E.J.Bartley,R.B.Fillingim.Sex differences in pain:a brief review of clinical and experimental findings[J].British Journal of Anaesthesia,2013,111(1):52-58.
2Kushang V.Patel,Jack M.Guralnik,Elizabeth J.Dansie,et al.Prevalence and Impact of Pain among Older Adults in the United States:Findings from the2011 National Health and Aging Trends Study[J].Pain,2013,154(12):1-22.
3HM Engjom,N-H Morken,OF Norheim,et al.Availability and access in modern obstetric care:a retrospective population-based study[J].BJOG,2014,121(3):290-299.
