Computational Methods and Clinical Applications for Spine Imaging- 4th International Workshop and Challenge, {CSI} 2016, Held in Conjunctionwith {MICCAI} 2016, Athens, Greece, October 17, 2016, Revised SelectedPapers 2016 (1) @author@, Computational Methods and Clinical Applications for Spine Imaging- 4th International Workshop and Challenge, CSI 2016, Held in Conjunctionwith MICCAI 2016, Athens, Greece, October 17, 2016, Revised SelectedPapers, volume 10182, 2016