Primary Outcomes: The primary outcome measure is improvement in the Physical Component Scale (PCS) of the SF-36V at follow-up relative to baseline. The primary end point will be the proportion of patients with more than a seven unit increase in the PCS at 12 months. Important secondary outcome measures are a pain scale (McGill Pain Questionnaire), a fatigue scale (Multidimensional Fatigue Inventory), a neurocognitive symptoms scale (Cognitive Failures Questionnaire), and a GWI Symptom Checklist developed specifically for this study.