1. Nonlinearity and Complexity Research Group, Aston University, Birmingham, B4 7ET, U.K.
2. RIKEN Advanced Institute for Computational Science, 7-1-26, Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
3. Computational Biology Research Center, National Institute of Advanced Industrial Science & Technology, 2-4-7 Aomi, Koto-ku, Tokyo 135-0064, Japan