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Pain, Postoperative
Analgesics, Opioid
Dextromethorphan
Morphine
Lidocaine
Isoflurane
Fentanyl
Local Anesthetics
Meperidine
Pain Measurement
Prospective Studies
General Anesthesia
Double-Blind Method
Intratracheal Intubation
Analgesia, Epidural
Anesthesia, Epidural
Patient-Controlled Analgesia
Wistar Rats
Rats
Evoked Potentials, Auditory
Co-Publications
63
43
22
14
13
12
9
8
7
5
4
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