9Varan A, Yazici N, Akalan N, et al.Primitive neuroectodermal tumors of the central nervous system associated with genetic and metabolic defects[J]. J NeurosurgSci, 2012, 56(1): 49-53.
10Dai L,Zhu J,Liang J, et al. Birth defects surveillance inChina[J]. World J Pediatr,2011,7(4) :302-310.
