Fig. 4

Normalization of gene methylation profiling (a1 GSE76938 gene methylation profiling data value distribution; a2 normalization of GSE76938 gene methylation profiling data; b1 GSE73549 gene methylation profiling data value distribution; b2 normalization of GSE73549 gene methylation profiling data; c1 GSE84749 gene methylation profiling data value distribution; c2 normalization of GSE84749 gene methylation profiling data; d1 GSE52955 gene methylation profiling data value distribution; d2 normalization of GSE52955 gene methylation profiling data)