Supplementation of retrobulbar block with clonidine in vitreoretinal surgery: effect on postoperative pain by Yazbeck-Karam, Vanda G., MD, Siddik-Sayyid, Sahar M., MD, Nader, Elie L. Abi, MD, Barakat, Daisy E., MD, Karam, Hoda S., MD, Cherfane, Georges M., MD, Hussein, Jalal N. Hajj, MD, Aouad, Marie T., MD

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