This work is supported by Chinese National Key Basic Research Program (2007CB411800) and Chinese National Science Foundation Outstanding Young Investigator Program (NSFC 40788002), and Major Research Project (NSFC 40890155). We are indebted to Drs. Boyin Huang, Ping Chang, Lisan Yu, and Ronghua Zhang for helpful discussions. Comments from both anonymous reviewers improve the paper substantially in many aspects.
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