Effectiveness and safety of ultra-low-dose spinal anesthesia versus perineal blocks in hemorroidectomy and anal fistula surgery: a randomized controlled trial by Rafael Peterson Soares Santos, Alfredo Dias de Oliveira-Filho, Manoel Álvaro de Freitas Lins Neto, Lucas Correia Lins, Fabiano Timbó Barbosa, Sabrina Joany Felizardo Neves

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