Predictive pre-operative diagnostic added value of 1 H Magnetic Resonance Spectroscopy, interictal 18 F-Fluorodesoxyglucose Positron Emission Tomography and ictal Single Photon Emission Computed Tomography for localization and lateralization of the epileptogenic zone and for outcome in the evaluation of candidates for epilepsy surgery: a meta-analysis from January 1992 to July 2003 - Willmann, Olaf (2004)