Spine
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A longitudinal cotwin control study of the Vietnam Era Twin Registry. ⋯ 3.
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Case series. ⋯ 4.
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Validation of a translated, culturally adapted questionnaire. ⋯ 3.
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A genetic association study. ⋯ N/A.
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Observational study (Ethics Committee Number 973.648). ⋯ 3.