GTF2H2 and proximal spinal muscular atrophy: The accuracy of this novel real-time PCR for GTF2H2 exon 10 was 99.2 % (239/241), and the false positive and negative rates were 0.8 % (2/238) and 0, respectively, based on the results of MLPA plus multiplex PCR in groups of SMA children and normal children.