Watanabe, K., Tokumine, J., Yorozu, T., Moriyama, K., Sakamoto, H., Inoue, T. Particulate-steroid betamethasone added to ropivacaine in interscalene brachial plexus block for arthroscopic rotator cuff repair improves postoperative analgesia. BMC Anesthesiology 2016; 1: 84