Updates are available Erratum dated 2014-06-20
Click to view Erratum: https://doi.org/10.1186/bf03351615
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Authors
Tanaka, Hidefumi
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Article History
Received: 3 March 1999
Revised: 1 October 1999
Accepted: 12 October 1999
First Online: 20 June 2014
Free to read: This content has been made available to all.
