Intensive Outpatient Treatment (also known as IOP for Intensive Outpatient Program) is a primary treatment program recommended in some circumstances by a clinical and medical assessment. IOP may be recommended for those who do not need medically-supervised detox.
The genitive is the case (or function) of an inflected form of a noun or pronoun showing ownership, measurement, association, or source. Adjective: genitival. The suffix -'s on nouns is a marker of genitive case in English. Genitive case can also be indicated by an of phrase after a noun.
E. Partitive Genitive (Wholative) - The genitive substantive (preceded by the article) can indicate the whole of which the head noun is a part. The word of can be substituted the words  which is a part of . This use of the genitive requires the head noun to in some way imply or indicate portion.E.g .. Genitive of Direct Object-after certain verbs-Many verbs, such as those of the five physical senses and of emotion, etc., require that their direct object be in the genitive case (as opposed to the accusative case which is normally expected).