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Plant Extracts
Fentanyl
Salix
Analgesics, Opioid
Glycosides
Narcotics
Pyrans
Plant Preparations
Phytotherapy
Analgesia, Epidural
Patient-Controlled Analgesia
Double-Blind Method
Harpagophytum
Sambucus nigra
Low Back Pain
Pain, Postoperative
Osteoarthritis
Pain
Pain Measurement
Treatment Outcome
Co-Publications
11
9
8
5
2
1
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