7Li S,Cao J, Xiac N. Efficacy and safety of levetiracetam as an add-on therapy in children aged less than 4 years with refracto- ry epilepsy[J]. J Child Neurol,2010,25(5):609-613.
8Li J,Xiao N, Chen S. Efficacy and tolerability of levetiraeetam in children with epilepsy [J]. Brain Dev, 2011,33 (2) : 145- 151.