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First Author:
 
Go Tamakoshi
Kobe University
tamakosh@stu.kobe-u.ac.jp
 
2-1, Rokkodai, Nada-Ku
Kobe, 657-8501, Japan
 
 
 

Second Author:

Shigeyuki Hamori
Kobe University
hamori@econ.kobe-u.ac.jp
 
Kobe, 657-8501, Japan