1. Continuous use of an oral contraceptive for endometriosis-associated recurrent dysmenorrhea that does not respond to a cyclic pill regimen 
Paolo Vercellini, M.D., Giada Frontino, M.D., Olga De Giorgi, M.D., Giuliana Pietropaolo, M.D., Roberta Pasin, M.D., Pier Giorgio Crosignani, M.D. 
Fertility and Sterility 
Volume 80, Issue 3, Pages (September 2003)
DOI: /S (03)

2. FIGURE 1
Variations of intensity of dysmenorrhea after switch from cyclic to continuous oral contraceptive use. (A), Visual analog scale scores. (B), Verbal rating scale scores. Values are mean ± SD. *P<.001 compared with corresponding baseline value, paired t test.
Vercellini. Continuous OC use for recurrent endometriosis.Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )