Reference:
  Author: >
    Paul A. Yushkevich and Joseph Piven and Heather Cody Hazlett
    and Rachel Gimpel Smith and Sean Ho and James C. Gee and Guido Gerig
  Title: >
    User-guided 3D active contour segmentation of anatomical structures:
    Significantly improved efficiency and reliability
  Journal: Neuroimage
  Year: 2006
  Volume: 31
  Pages: 1116-1128
  DOI: 10.1016/j.neuroimage.2006.01.015
