The study will be proposed to man entering the prison of La Roche sur Yon. Participants will be randomized into two arms: one arm realize a dosage of vitamin D at the entrance and 6 months after the entry and the second arm will carry only a dosage six months after entry. the purpose of the study is to determine the interest of dosage of vitamin D in biological assessment of entry into prison house.
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Dosage of Vitamin D
Timeframe: 6 month