Protocol of a clinical trial on the effectiveness of pudendal nerve block with and without neurostimulation in reducing posthemorroidectomy pain by Soto Sánchez, A., Cano Valderrama, O., Vilela Ferrer, I., Díaz Jiménez, N., Hernández Barroso, M., Bravo García, P.L., Hernández Hernández, G., Balanzá, J.J.

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