Thoracic sympathetic block for the treatment of complex regional pain syndrome typo 1: A double blind randomized controlled study - Rocha, Roberto de Oliveira; Teixeira, Manoel Jacobsen; Yeng, Lin Tchia; Cantara, Mirlene Gardin; Faria, Viviane Gentil; Liggieri, Victor; Loduca, Adrianna; Muller, Barbara Maria; Souza, Andrea C. M. S.; Andrade, Daniel Ciampi de (Pain, 2014)