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Student and Exchange Visitor Program (SEVIS)

Student and Exchange Visitor Program (SEVIS) is an arm of the Immigration and Customs Enforcement Department of Homeland Security, which oversees international nonimmigrant students and exchange visitors in the United States; the special student extension is based on the consistent requirement that both the school curriculum and then the student conforms to strict educational requirements, while the student remains in the United States.   
The relevance for treatment is that this bureaucratic approval is tremendously helpful for non-American students to remain in un-interrupted treatment for longer than the typical “visitor” visa would allow.