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3. Prevention of neural tube defect recurrences in Yorkshire: final report;Smithells, R.W.; Sheppard, S.; Wild, J.; Schorah, C.J.;Lancet,1989
4. Neural tube defect recurrence after 'partial' vitamin supplementaton;Sheppard, S.; Nevin, N.C.; Seller, M.J.;J Med Genet,1989
5. Prevention of neural-tube-defect recurrences;Nevin, N.C.; Seller, M.J.;Lancet,1990