[Opioids in chronic noncancer pain-are opioids superior to nonopioid analgesics? A systematic review and meta-analysis of efficacy, tolerability and safety in randomized head-to-head comparisons of opioids versus nonopioid analgesics of at least fou
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| Description | scientific article |
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author: Winfried Häuser |
| Publication date | February 1, 2015 |
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