1. Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523808, China
2. Key Laboratory for Epigenetics of Dongguan City, China-America Cancer Research Institute, Guangdong Medical University, Dongguan 523808, China
3. Institute of Modern Biology, Nanjing University, Nanjing 210023, China