ST. LOUIS, Missouri, Jan. 7 (TNSres) -- The Washington University School of Medicine issued the following news release: * * * Study may lead to personalized prevention, management tools for post-operative pain * * * After surgery, pain is expected and often subsides within a few weeks. But for around 20% of patients, persistent pain may continue for months or even years after a procedure, impacting quality of life and putting patients at risk for opioid overuse. Symptoms vary widely in sever  more