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. Author manuscript; available in PMC: 2012 Jul 24.
Published in final edited form as: Phys Med Rehabil Clin N Am. 2010 Nov;21(4):659–677. doi: 10.1016/j.pmr.2010.08.002

Fig. 2.

Fig. 2

Cumulative number of ESI systematic reviews and RCTs. (From Friedly J, Chan L, Deyo R. Increases in lumbosacral injections in the Medicare population: 1994 to 2001. Spine 2007;32(16):1756.)