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pain anesthesia painless labor disk herniation low back pain radiofrequency lumbar discectomy endoscopic discectomy osteoarthritis djd spinal peld discopathy intubation general anesthesia patient safety painless delivery regional anesthesia stem cell therapy pain control regenerative medicine chronic pain exosome epidural analgesia acute pain emergency department glottis pcea copd anesthesia local anesthesia ihd anesthesia crf anesthesia mechanical ventilation oxygenation nurse icu laryngoscopy ventilation delivery lma airway devices airway breast feeding pca labore childbirth entonox nvd iasp tissue engineering degenerative disc disease discogenic pain pain killers erector spinae plane block esp block cancer pain pain management postoperative pain surgery degenerative joint disease knee rf oa knee vaginal delivery kambin's triangle ldh cervicogenic headache cervical pain neck pain headache rfid lbp endoscopy endoscopic surgery patient_safety bupivacaine ropivacaine ventilator anesthesiology resident