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Updated: Sep 2, 2026

Use of the Operant Orofacial Pain Assessment Device (OPAD) to Measure Changes in Nociceptive Behavior
12:20

Use of the Operant Orofacial Pain Assessment Device (OPAD) to Measure Changes in Nociceptive Behavior

Published on: June 10, 2013

Intestinal effect and analgesia: evidence for different involvement of opioid receptor subtypes in periaqueductal

D Parolaro, G Crema, M Sala

    European Journal of Pharmacology
    |January 14, 1986
    PubMed

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