CODEX weak lensing: Concentration of galaxy clusters at z ~ 0.5 by Cibirka, N, Cypriano, E, Brimioulle, F, Gruen, D, Erben, T, van Waerbeke, L, Miller, L, Finoguenov, A, Kirkpatrick, C, Henry, J, Rykoff, E, Rozo, E, Dupke, R, Kneib, J, Shan, H, Spinelli, P