Pain Research and Management / 2017 / Article / Fig 2

Clinical Study

Efficacy and Safety of Transdermal Buprenorphine versus Oral Tramadol/Acetaminophen in Patients with Persistent Postoperative Pain after Spinal Surgery

Figure 2

Flow of patients through the trial. FAS: full analysis set; BTDS: buprenorphine transdermal system (NORSPAN); TA: tramadol/acetaminophen.

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