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Department of Hygiene, Chiba University School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba, 260-8670, Japan
Received 24 July 2000; received in revised form 11 December 2000; accepted 18 December 2000.
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☆ Editor: S. Borg
PII: S0741-8329(01)00131-8
© 2001 Elsevier Science Inc. All rights reserved.
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