4004940 UBESS ultrasound-based endometriosis staging system 8 4004942 UBESS unilateral biportal endoscopic spinal surgery 6 4004943 UBESS UBE-assisted spinal surgery 1 4004941 UBESS ultrabattery energy storage system 1 4004944 UBESS Ultrasound-Based Endometriosis Staging System score 1