We thank the editors and the two anonymous reviewers for their valuable suggestions and comments. This study is supported by the program of Ministry of Science and Technology of China (2004CB418300), National Natural Science Foundation of China (40675034), and China–Japan intergovernmental cooperation program of the Japan International Cooperation Agency. The first author benefited by being accepted into the guest professor program at the Institute of Low Temperature Science, Hokkaido University, during October 2002–February 2003 when he began the study that became this paper.
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