Efficacy of dexamethasone or clonidine as adjuvants in interscalene brachial plexus block for preventing rebound pain after shoulder surgery: a randomized clinical trial by Layana Vieira Nobre, Leonardo Henrique Cunha Ferraro, Juscelino Afonso de Oliveira Júnior, Vitória Luiza Locatelli Winkeler, Luis Flávio França Vinhosa Muniz, Hiago Parreão Braga, Plínio da Cunha Leal

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