No abstract available
MeSH terms
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Adolescent
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Adult
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Back Pain / epidemiology
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Back Pain / immunology*
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Czechoslovakia
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Female
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HLA Antigens / analysis*
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HLA-B27 Antigen
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Humans
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Industry
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Male
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Middle Aged
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Occupational Diseases / epidemiology
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Occupational Diseases / immunology
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Spinal Diseases / immunology*
Substances
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HLA Antigens
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HLA-B27 Antigen