1. Crooks J., Aboul-Khair S.A., Turnbull A.C., Hytten F.E. The incidence of goitre during pregnancy. Lancet 2: 334, 1964.
2. Crooks J., Tulloch M.I., Turnbull A.C., Davidsson D., Skulason T., Snaedal G. Comparative incidence of goitre in pregnancy in Iceland and Scotland. Lancet 2: 625, 1967.
3. Baschieri L., Andreani D., Andreoli M., Negri M., Cassano C. II ricambio dello iodio in gravidanza. Folia Endocrinol. 12: 1, 1959.
4. Cassano C., Baschieri L., Andreani D. Etude de 48 cas de goitre simple avec élévation de la cléarance rénale de l’iode. In: Pitt-Rivers R. (Ed.), Advances in thyroid research. Pergamon Press, Oxford, 1961, p. 307.
5. Aboul-Khair S.A., Crooks J., Turnbull A.C., Hytten F.E. Physiological changes in thyroid function during pregnancy. Clin. Sci. 27: 195, 1964.