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Pain
Neoplasms
Pain, Postoperative
Intractable Pain
Analgesics, Opioid
Analgesics
Morphine
Fentanyl
Tramadol
Opioid Peptides
Receptors, Opioid
Pain Measurement
Prospective Studies
Patient-Controlled Analgesia
Palliative Care
Administration, Cutaneous
Double-Blind Method
Sprague Dawley Rats
Rats
Germany
Co-Publications
35
26
25
16
14
8
7
5
4
3
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