1 School of Computer Science and Technology, Tianjin University, Tianjin 300354, China.
2 Institute of Informatics, Silesian University of Technology, 44-100 Gliwice, Poland.
3 Department of Mathematics and Statistics and Department of Agronomy, Horticulture, and Plant Science, BioSNTR, South Dakota State University, Brookings, SD 57007, USA.
4 Center for Bioinformatics and Systems Biology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA.