Comparison of the median and intermediate approaches to the ultrasound-guided sacral erector spinae plane block: a cadaveric and radiologic study by Bilge Olgun Keleş, Necati Salman, Elvan Tekir Yılmaz, Habip Resul Birinci, Alparslan Apan, Selami İnce, Ali Faruk Özyaşar, Aysun Uz

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