1. Are serum human chorionic gonadotropin clearance curves of use in monitoring methotrexate treatment in cervical pregnancy? 
Petra J. Hajenius, M.D., Daphne Roos, M.D., Willem M. Ankum, M.D., Ph.D., Fulco Van der Veen, M.D., Ph.D. 
Fertility and Sterility 
Volume 70, Issue 2, Pages (August 1998)
DOI: /S (98)

2. FIGURE 1
(A), The absolute serum hCG clearance curve. E = embolization procedure; MTX = methotrexate; C = balloon catheter tamponade; H = hysterectomy. The numbers in the boxes represent the amount of vaginal blood loss in milliliters. (B), The relative serum hCG clearance curve.
Fertility and Sterility  , DOI: ( /S (98) )