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机构:
Stockholm Sch Econ, Ctr Econ Stat, Dept Econ, POB 6501, SE-11383 Stockholm, Sweden
Hokkaido Univ, Global Inst Collaborat Res & Educ, Sapporo, Hokkaido, Japan Aarhus Univ, Dept Econ & Business Econ, Fuglesangs Alle 4, DK-8210 Aarhus V, Denmark