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.
For other uses, see Gerbil (disambiguation) . A gerbil is a small mammal of the order Rodentia. Once known simply as  desert rats , the gerbil subfamily includes about 110 species of African, Indian, and Asian rodents, including sand rats and jirds, all of which are adapted to arid habitats.