1 Vijay M. Ravindra, MD, MSPH, Steven S. Senglaub, MS, Abbas Rattani, MBe, Michael C. Dewan, MD, MSCI, Roger Härtl, MD, Erica Bisson, MD, MPH, Kee B. Park, MD, and Mark G. Shrime, MD, MPH, PhD,Degenerative Lumbar Spine Disease: Estimating Global Incidence and Worldwide Volume,Global Spine Journal 8(117):219256821877076 · April 2018.