Study to Investigate Lacosamide as Add-on Therapy in Subjects ?4 Years to <17 Years of Age With Partial Onset Seizures

Study to evaluate the efficacy of Lacosamide (LCM) administered in addition to 1 to ?3 other Anti-Epileptic Drugs in subjects with epilepsy ?4 years to <17 years of age who currently have uncontrolled partial onset seizures.>