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I would like to acknowledge helpful comments from Milada Vachudová, two anonymous referees, and the LREG editorial board. I am also grateful for financial support through a Marie Curie Fellowship at the Robert Schuman Centre for Advanced Studies of the European University Institute (Project No.: MEIF-CT-2004-514104).
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| http://www.livingreviews.org/lreg-2006-3 | 
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