O-arm navigation-based transforaminal unilateral biportal endoscopic discectomy for upper lumbar disc herniation: an innovative preliminary study by Dong Hyun Lee, Choon Keun Park, Jin-Sung Kim, Jin Sub Hwang, Jin Young Lee, Dong-Geun Lee, Jae-Won Jang, Jun Yong Kim, Yong-Eun Cho, Dong Chan Lee

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