Perform the indicated operations and simplify. 
Definitions:
ECT
Electroconvulsive Therapy, a medical treatment most commonly used for severe depression which involves inducing seizures in an anesthetized patient with the aim of providing relief from psychiatric illnesses.
Lithium
A metallic element that occurs in nature as a mineral salt and is an effective treatment for bipolar disorders.
Dietary Restrictions
Limitations on what an individual can eat, often for health, religious, or ethical reasons.
Brain Stimulation
A therapeutic procedure that uses electrical impulses to stimulate or modulate brain activity for treating various neurological and psychiatric conditions.
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