The first author gives his thanks to Yihui Ding, Shaowu Wang, Longxun Chen, Panmao Zhai, Anjian Sun, Zongci Zhao, and Xuechun Lin for their constructive comments. We also greatly appreciate the critical comments and suggestions by the three anonymous reviewers. This work has been financed by the Natural Science Foundation of China (Grant 40575039) and the Ministry of Science and Technology of China (Grant 2001BA611B-01).
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