Efficacy of epidural perineural injections with autologous conditioned serum for lumbar radicular compression: an investigator-initiated, prospective, double-blind, reference-controlled study - Becker, C; Heidersdorf, S; Drewlo, S; de Rodriguez, S Z; Krämer, J; Willburger, R E (Spine (Phila Pa 1976), 2007)