[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3106396/ Parida, Satyen; Allampalli, Varshad; Krishnappa, Sudeep (2011). "Catatonia and jaw dislocation in the postoperative period with epidural morphine". Indian Journal of Anaesthesia. 55 (2): 184–6. doi:10.4103/0019-5049.79904. PMC 3106396 Freely accessible. PMID21712880.
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