[1] Zapanta, P.E. and Shokri, T. (2010) Embryology of the Thyroid and Parathyroids, Thyroid Embryology Clinical Correlations.
http://emedicine.medscape.com/article/845125-overview#aw2aab6b5
[2] Can, A.S. and Peker, K. (2008) Comparison of Palpation-Versus Ultrasound-Guided Fine-Needle Aspiration Biopsies in the Evaluation of Thyroid Nodules. BioMed Central Research Notes, 1, 12.
[3] Bruneton, J.N., Balu-Maestro, C., Marcy, P.Y., Melia, P. and Mourou, M.Y. (1994) Very High Frequency (13 MHz) Ultrasonographic Examination of the Normal Neck: Detection of Normal Lymph Nodes and Thyroid Nodules. Journal of Ultrasound in Medicine, 13, 87-90.
[4] Nabriski, D., Ness-Abramof, R., Brosh, T., Konen, O., Shapiro, M.S. and Shenkman, L. (2003) Clinical Relevance of Non-Palpable Thyroid Nodules as Assessed by Ultrasound-Guided Fine Needle Aspiration Biopsy. Journal of Endocrinological Investigation, 26, 61-64.
http://dx.doi.org/10.1007/BF03345124
[5] http://www.ultrasoundpaedia.com/normal-thyroid.
[6] http://fitsweb.uchc.edu/student/selectives/Luzietti/Thyroid_hyperthyroid.htm
[7] Carroll, B.A. (1982) Asymptomatic thyroid Nodules: Incidental Sonographic Detection. American Journal of Roentgenology, 138, 499-501.
[8] Steele, S.R., Martin, M.J., Mullenix, P.S., Azarow, K.S. and Andersen, C.A. (2005) The Significance of Incidental Thyroid Abnormalities Identified during Carotid Duplex Ultrasonography. Archives of Surgery, 140, 981-985.
http://dx.doi.org/10.1001/archsurg.140.10.981