2012-003770-11: A multi-center, randomized parallel group pilot study to investigate the mechanism of action of tapentadol PR and oxycodone CR in subjects with osteoarthritis knee pain |
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| Ongoing | 2 | 60 | Europe | Palexia Depot, OxyContin, Palexia Depot, OxyContin | C4Pain ApS, Grünenthal GmbH | Osteoarthritic Knee Pain. | | | | |