Further to policy 4.3.2, the expense authority may receive assistance from staff to fulfill his/her responsibilities. However, the expense authority is accountable for expenditure approval, and approval of payment requisitions for direct invoices (i.e., vendor invoices or items not matched to a purchase order or contract using iProcurement).
Comorbidity: Addiction and Other Mental Illnesses. When two disorders or illnesses occur in the same person, simultaneously or sequentially, they are described as comorbid. Comorbidity also implies interactions between the illnesses that affect the course and prognosis of both.
Schizophrenia Biology Â· Schizophrenia and Substance Abuse. Psychiatric problems often occur comorbidly, or in association with one another. A common comorbid disorder in association with mental illness is drug addiction. It has been hypothesized that this may be because people who suffer from mental illness are more susceptible to drug use and addiction because of their compromised mental state and/or the difficulty they experience in dealing with their illness.