Epione: An Innovative Pain Management System Using Facial Expression Analysis, Biofeedback and Augmented Reality-Based Distraction. - Stamatios Georgoulis; Stefanos Eleftheriadis; Dimitris Tzionas; Konstantinos Vrenas; Panagiotis Petrantonakis; Leontios J. Hadjileontiadis (INCoS, 2010)