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2. Oral contraceptives and congenital limb-reduction defects;Janerich, D.T.; Piper, J.M.; Glebatis, D.M.;New Engl J Med,1974
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4. An epidemiological study ofcongenital reduction deformities of the limbs;Smith, E.S.O.; Dafoe, C.S.; Miller, JR, Banister; P.H.;Brit J Prev Soc Med,1977
5. An aetiological evaluation of increased occurrence of congenital limb reduction abnormalities in Hungary, 1975-1978;Czeizel, A.; Keller, S.; Bod, M.;Int J Epidemiol,1983