1. Gabapentin as an Adjuvant to Opioid Analgesia for Neuropathic Cancer Pain 
Augusto Caraceni, MD, Ernesto Zecca, MD, Cinzia Martini, MD, Franco De Conno, MD 
Journal of Pain and Symptom Management 
Volume 17, Issue 6, Pages (June 1999)
DOI: /S (99)

2. Fig. 1
Mean and standard deviations of the pain scores at T0 (basal assessment) and T2 (1–2 weeks of gabapentin administration). *Student’s t test
Journal of Pain and Symptom Management  , DOI: ( /S (99) )