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Pain
Chronic Disease
Intractable Pain
Depression
Analgesics
Analgesics, Opioid
Anti-Inflammatory Agents, Non-Steroidal
Antidepressive Agents
Dextromethorphan
Cytochrome P-450 CYP2D6
Pain Measurement
Retrospective Studies
Drug Dose Response Relationship
Pain Threshold
Double-Blind Method
Analgesia
Pain Management
Switzerland
Pain Clinics
Phenotype
Co-Publications
20
17
16
5
2
1
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