1.WHO/UNICEF/ICCIDD. Assessment of Iodine Deficiency Disorders and Monitoring their Elimination. A Guide for Programme Managers. Geneva: WHO/NHD/2001/01.1; 2007

2.Nada A, Mohamed Ahmed A, Vilallonga R, Armengol M, Moustafa I. A giant euthyroid endemic multinodular goiter with no obstructive or compressive symptoms. Case Rep Med 2011;2011:620480.

3.Ruppel GL, editor. Manual of Pulmonary Function Testing. 8th ed. St Louis: Mosby; 2003

4.Bonnema SJ, Andersen PB, Knudsen DU, Hegedüs L. MR imaging of large multinodular goiters: Observer agreement on volume versus observer disagreement on dimensions of the involved trachea. AJR Am J Roentgenol 2002;179:259-66.

5.Jameson JL. Disorders of the thyroid gland.In: Harrison’s Principles of Internal Medicine. 18th ed.,Vol. 2. NewYork, NY: The McGrawHill Companies; 2012. p. 2930-1

6.Clark H, Lal G. Thyroid, parathyroid, and adrenal.In: Brunicardi FC, Anderson DK, Billiar TR, Dunn DL, Hunter JG, Poliock RE, editors. Schwartz's Principles of Surgery. 8th ed., Vol. 2. New York: The McGraw-Hill Companies; 2007. p. 37.

7.Hanks JB. Endocrine-thyroid. In: Townsend CJ, Beauchamp RD, Evers BM, Mattox KL, editors. Sabiston Textbook of Surgery. 17th ed. Sec. VIII Philadelphia: Elesvier Saunder; 2004. p. 34

8.Clark OH, Caron NR. Endocrine surgery-fine needle aspiration biopsy of the thyroid: thyroid lobectomy and subtotal and total thyroidectomy. In: JEitor. Mastery of Surgery. 5th ed., Vol. 1. Philadelphia: Lippincott Williams & Wilkins; 2007. p. 34.

9. Committee on Fluoride in Drinking Water, Board on Environmental Studies and Toxicology, Division on Earth and Life Studies, National Research Council. Fluoride in Drinking Water: A Scientific Reviewof EPA’s Standards Book. Washington, DC, USA:Academic Publishers, The National Academic Press; 2006. p. 263