- Dr A Kamachi, First Department of Medicine, School of Medicine, Hokkaido University N-15, W-7 Kita-ku, Sapporo, 060-8638 Japan
- Received March 3, 2000
- Revision requested July 19, 2000
- Revised August 25, 2000
- Accepted September 25, 2000
- First published January 1, 2001.
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