1. State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P. R. China
2. University of Science and Technology of China Hefei 230026 P. R. China
3. School of Electrical Engineering & IntelligentizationDongguan University of Technology Dongguan 523808 P. R. China
4. School of Physical & Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
5. Department of Biochemistry and Molecular PharmacologyUniversity of Massachusetts Medical School Worcester MA 01605 USA