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UptoDate Oct. 2014, McClain, K.L., 2014
Needle Cervical Root Stimulation May be Complicated by Pneumothorax
Neurol 48:288-289, Sander,H.W.,et al, 1997
Case Record of MGH-NEJM Atheromatous Emboli to Brain
Kidney, 286:11461972., , 1972