title: What has happened to evidence-based medicine?
mesh_terms: D019317:Evidence-Based Medicine / Q000379:methods*; D006406:Hematoma / Q000139:chemically induced; D006801:Humans; D008160:Lumbosacral Plexus / Q000187:drug effects; D009407:Nerve Block / Q000009:adverse effects; D012187:Retroperitoneal Space / Q000473:pathology