1. Department of Clinical Laboratory , The Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital , Zhengzhou , Henan , P. R. China
2. Zhengzhou Key Laboratory of Digestive System Tumor Marker Diagnosis , Zhengzhou , Henan , P. R. China
3. Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules , Institute of Biophysics, Chinese Academy of Sciences , Beijing , P. R. China