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Reference
Helm, C. W.,
Lorenz, D. J.,
Meyer, N. J.,
Rising, W. R.,
&
Wulff, J. L.
. Retinoids for preventing the progression of cervical intra-epithelial neoplasia. Cochrane Database Syst.Rev., 4 (Art. No.: CD003296. DOI: 10.1002/14651858.CD003296. pub2): (--2007).

