Percutaneous Endoscopic Spinal Surgery for Degenerative Lumbar Spinal Stenosis in Elderly Patients at High Risk for General Anesthesia　
GAO Shangju，LI Wenyi，ZHANG Long，WEI Jingchao，CAO Can
Chinese General Practice . 2020, (27): 3433 -3439 .  DOI: 10.12114/j.issn.1007-9572.2019.00.817

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