Fentanyl Buccal Tablet Compared with Immediate-Release Oxycodone for the Management of Breakthrough Pain in Opioid-Tolerant Patients with Chronic Cancer and Noncancer Pain: A Randomized, Double-Blind, Crossover Study Followed by a 12-Week Open-Label Phase to Evaluate Patient OutcomesLynn R. Webster, Ronghua Yang, Kieran A. Slevin et al.|Pain Medicine|2013Cited by 29