1. A levonorgestrel-releasing intrauterine system for the treatment of dysmenorrhea associated with endometriosis: a pilot study 
Paolo Vercellini, M.D., Giorgio Aimi, M.D., Stefania Panazza, M.D., Olga De Giorgi, M.D., Antonella Pesole, M.D., Pier Giorgio Crosignani, M.D. 
Fertility and Sterility 
Volume 72, Issue 3, Pages (September 1999)
DOI: /S (99)

2. Figure 1
Baseline (open symbols) and 12-month follow-up (closed symbols) menstrual blood loss (A) and dysmenorrhea (B) scores in 17 women with endometriosis treated with a levonorgestrel-releasing intrauterine system according to, respectively, a pictorial chart devised by Higham et al. (4) and a 100-mm visual analogue scale. Horizontal bars are medians.
Vercellini. Levonorgestrel-releasing system. Fertil Steril 1999.
Fertility and Sterility  , DOI: ( /S (99) )