Comparative efficacy of epidural, subarachnoid, and intracerebroventricular opioids in patients with pain due to cancer

Reason for Withdrawal 2013: This review is now being updated by a new author team. The publication of the protocol is expected in late 2013. October 2015: after discussion with the authors and PaPaS editors, the decision was made to halt the development of the protocol that was being planned to replace and update this review. It was felt that the review question was no longer a priority. To view the published versions of this article, please click the 'Other versions' tab.