Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, Opiates and Synthetic Analgesic Drugs
Adams & Victors Principles of Neurology Chp 43, pg 1201, Ropper, A.H.,et al, 2014
Life-Threatening Cranial Dystonia Following Trihexyphenidyl Withdrawal
Movement Disorders 4:349-353, Gimenez-Roldan,S.,et al, 1989