1 College of Bioinformatics and Technology, Harbin Medical University, Harbin, Heilongjiang, China.
2 College of Bioinformatics and Technology, Harbin Medical University, Harbin, Heilongjiang, China liangcheng@hrbmu.edu.cn.
3 NHC Key Laboratory of Molecular Probe and Targeted Diagnosis and Therapy, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China.