<qa>  What is the BPI?The effectiveness of gabapentin will be assessed using the BPI. The BPI is a self-administered questionnaire that measures the severity of pain and the interference of pain on function over the past 24 hours. Other assessments will include the total Fibromyalgia Impact Questionnaire FIQ score; six 11-point Likert-type scales in the FIQ that measure pain, fatigue, morning tiredness, stiffness, anxiety, and depression; the mean tender point pain threshold; Clinical Global Impression of Severity CGI-Severity; Patient Global Impression of Improvement PGI-Improvement; the Short-form McGill Pain Questionnaire SF-MPQ; the Medical Outcomes Study Short Form-36 SF-36; the Montgomery Asberg Depression Rating Scale MADRS; and the Medical Outcomes Sleep Scale MOS-Sleep. 