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. 1980;2(2):93–94. doi: 10.1155/S1463924680000314
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R Haeckel
, O Sonntag
, K Pethy
R Haeckel
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O Sonntag
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K Pethy
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Copyright © 1980 Hindawi Publishing Corporation.
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PMCID: PMC2547236 PMID: 18927724