The authors thank three anonymous reviewers for their careful reading of the manuscript and helpful comments. This study was partially conducted when the first author was visiting Research Institute for Sustainable Humanosphere (RISH) at Kyoto University during her sabbatical leave. This work was supported by R02-2004-000-10027-0 from the Basic Research Program of the Korea Science and Engineering Foundation and by the Ministry of Science and Technology of Korea through the National Research Laboratory Program.
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