1. Taketani Y, Ishimaru T, Hoshiai H, et al. Research on current situation and treatment strategies of endometriosis from viewpoint of reproductive health. Health Sciences Research Grant-in-Aid in 1997. 1998. p. 99–104. https://www.niph.go.jp/wadai/mhlw/ssh_1997_16.htm . Accessed 13 July 2016. (in Japanese).
2. Kawama M, Maruyama K, Nakamura K. Prevalence of dysmenorrhea and its correlating lifestyle factors in Japanese female junior high school students. Tohoku J Exp Med. 2015;236:107–13.
3. Guideline on treatment in obstetrics and gynecology. Outpatient visit version 2014. http://www.jsog.or.jp/activity/pdf/gl_fujinka_2014.pdf . Accessed 30 Aug 2016.
4. Tanaka E, Momoeda M, Osuga Y, et al. Burden of menstrual symptoms in Japanese women—an analysis of medical care-seeking behavior from a survey-based study. Int J Women’s Health. 2014;6:11–23.
5. Proctror M, Farquhar C. Diagnosis and management of Dysmenorrhea. BMJ. 2006;332:1132–8.