1. Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
2. Department of Mathematics and Statistics, University of Strathclyde, 26 Richmond Street, Glasgow G11HX, United Kingdom
3. IBM Research, MIT-IBM A.I. Lab, Cambridge, Massachusetts 02142, United States
4. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, United States