Reply to Marcus V. Cronauer, Axel S. Merseburger, and M. Raschid Hoda's Letter to the Editor re: Christof Bernemann, Thomas J. Schnoeller, Manuel Luedeke, et al. Expression of AR-V7 in Circulating Tumour Cells Does Not Preclude Response to Next Generation Androgen Deprivation Therapy in Patients with Castration Resistant Prostate Cancer. Eur Urol 2017;71:1-3