Evaluation of a navigation system for ENT with surgical efficiency criteria. - Strauss,G.; Koulechov,K.; Rottger,S.; Bahner,J.; Trantakis,C.; Hofer,M.; Korb,W.; Burgert,O.; Meixensberger,J.; Manzey,D.; Dietz,A.; Luth,T. (Laryngoscope, 2006)