44 Health services; medical services; surgical services; endoscopic surgery services; endoscopic spinal surgery services; advice with respect to health services; advice with respect to medical services; advice with respect to surgical services; health risk assessment studies; health services; medical services; surgical services; endoscopic surgery services; endoscopic spinal surgery services; advice with respect to health services; advice with respect to medical services; advice with respect to surgery services; health risk assessment studies; operation technique, namely, surgical services; operation technique relating to the spine, namely, surgical services; operation technique for treating degenerative stenosis of the spinal canal, namely, surgical services; operation technique making use of an endoscope intended to protect soft tissue, namely, surgical services; surgical technique, namely, surgical services; surgical technique related to the spinal column, namely, surgical services; endoscopic surgery technique, namely, surgical services; endoscopic surgery technique of the spine, namely, surgical services; endoscopic surgery technique intended to protect soft tissue, namely, surgical services; endoscopic decompressing technology, namely, surgical services