1. Friedly J, Chan L, Deyo R (2007) Increases in lumbosacral injections in the Medicare population, 1994 to 2001. Spine (Phila Pa 1976) 32:1754–1760
2. Manchikanti L, Pampati V, Boswell MV, Smith HS, Hirsch JA (2010) Analysis of the growth of epidural injections and costs in the Medicare population: a comparative evaluation of 1997, 2002, and 2006 data. Pain Physician 13:199–212
3. Manchikanti L, Pampati V, Falco FJ, Hirsch JA (2013) Assessment of the growth of epidural injections in the Medicare population from 2000 to 2011. Pain Physician 16:E349–E364
4. Manchikanti L, Pampati V, Falco FJ, Hirsch JA (2015) An updated assessment of utilization of interventional pain management techniques in the Medicare population: 2000–2013. Pain Physician 18:E115–E127
5. MacMahon PJ, Eustace SJ, Kavanagh EC (2009) Injectable corticosteroid and local anesthetic preparations: a review for radiologists. Radiology 252:647–661