PNist: interactive volumetric measurements of plexiform neurofibromas in MRI scans. - Lior Weizman; Dina Helfer; Dafna Ben-Bashat; Li-tal Pratt; Leo Joskowicz; Shlomi Constantini; Ben Shofty; Liat Ben-Sira (Int. J. Comput. Assist. Radiol. Surg., 2014)