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Tirta, I. .; Widnyana, I. M. G. .; Sinardja, C. D. .; Putra, K. A. H. .; Parami, P. .; Suarjaya, I. P. P. .; Wiryana, M. .; Senapathi, T. G. A. . THE EFFECTIVENESS OF GREATER AURICULAR NERVE (GAN) BLOCK USING ISOBARIC ROPIVACAINE AS AN ANALGESIC ADJUVANT AS COMPARED TO INTRAVENOUS OPIOID AS ANALGESIA FOR MIDDLE EAR SURGERY. PREPOTIF 2024, 8, 2559-2569.