Desmet, M., Braems, H., Reynvoet, M., Plasschaert, S., Van Cauwelaert, J., Pottel, H., Carlier, S., Missant, C., Van De Velde, M. I.V. and perineural dexamethasone are equivalent in increasing the analgesic duration of a single-shot interscalene block with ropivacaine for shoulder surgery: A prospective, randomized, placebo-controlled study. British Journal of Anaesthesia 2013; 3: 445-452