Aghayev, K., & Vrionis, F. (2014). Answer to the Letter to the Editor of C. Mehren et al. entitled “Technical Innovation?” Letter to the Editor regarding the article “Mini-open lateral retroperitoneal lumbar spine approach using psoas muscle retraction technique. Technical report and initial results on six patients” (by K. Aghayev and F. D. Vrionis: Eur Spine J, 2013. 22(9): p. 2113–9). Springer Berlin Heidelberg.

Aghayev, Kamran, and Frank Vrionis. Answer to the Letter to the Editor of C. Mehren Et Al. Entitled “Technical Innovation?” Letter to the Editor Regarding the Article “Mini-open Lateral Retroperitoneal Lumbar Spine Approach Using Psoas Muscle Retraction Technique. Technical Report and Initial Results On Six Patients” (by K. Aghayev and F. D. Vrionis: Eur Spine J, 2013. 22(9): P. 2113–9). Springer Berlin Heidelberg, 2014.

Aghayev, Kamran, and Frank Vrionis. Answer to the Letter to the Editor of C. Mehren Et Al. Entitled “Technical Innovation?” Letter to the Editor Regarding the Article “Mini-open Lateral Retroperitoneal Lumbar Spine Approach Using Psoas Muscle Retraction Technique. Technical Report and Initial Results On Six Patients” (by K. Aghayev and F. D. Vrionis: Eur Spine J, 2013. 22(9): P. 2113–9). Springer Berlin Heidelberg, 2014.