Spine
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An exploratory longitudinal study. ⋯ 3.
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Immunohistochemical and real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis. ⋯ N/A.
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Retrospective analysis of prospectively collected data. ⋯ 3.
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An epidemiological study using national administrative data from the MarketScan database. ⋯ 3.