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Nagar, S.; Paliwal, N.; Lohia, R.; Saluja, V.; Dutt, N. Comparative Study of Two Thoracic Segmental Spinal Anaesthesia Techniques for Laparoscopic Cholecystectomy: Low-Dose Hypobaric Ropivacaine and Isobaric Ropivacaine at T10-11 Intervertebral Space Vs. Standard Technique Using Isobaric Levo Bupivacaine at T8-T10 Intervertebral Space. Int J Clin Trials 2024, 11, 17-23.