2. Helfand N, Crapo LM: Screening for thyroid disease. Ann Intern Med 1990; 112: 840-849

3. Gold MS, Pottash AC, Extein I: Thyroid dysfunction or depression. JAMA 1981; 245: 1919-1925

4. Tunbridge WMG, Evered DC, Hall R, et al: The spectrum of thyroid disease in a community: the Whickham survey. Clin Endocrinol 1977; 7: 481-493

5. Falkenberg M, Kagedal B, Norr A: Screening of an elderly female population for hypo- and hyperthyroidism by use of a thyroid hormone panel. Acta Med Scand 1983; 214: 361-365

6. Parle JV, Franklyn JA, Cross KW, et al: Assessment of a screening process to detect patients aged 60 years and over at risk of hypothyroidism. Brit J Gen Pract 1991; 41: 414-416

7. National Cancer Institute of Canada: Canadian Cancer Statistics, 1993. Toronto, 1993

8. Toft AD: Use of sensitive immunoradiometric assay for thyrotropin in clinical practice. Mayo Clin Proc 1988; 63: 1035-1042

9. Brander A, Viikinkoski P, Nickels J, et al: Thyroid gland: U.S. screening in a random adult population. Radiology 1991; 181: 683-687

10. Sawin CT: Thyroid dysfunction in older persons. Advanc Intern Med (Mosby Year Book) 1991; 37: 223-248

11. Cooper DS, Halpern R, Wood LC, et al: Thyroxine therapy in subclinical hypothyroidism. A double-blind, placebo-controlled trial. Ann Intern Med 1984; 101: 18-24

12. Nyström E, Caidahl K, Fager G, et al: A double-blind cross-over 12-month study of L-thyroxine treatment of women with 'subclinical' hypothyroidism. Clin Endocrinol-Oxf 1988; 29: 63-76

13. Akslen LA, Haldorsen T, Thoresen SO, et al: Survival and causes of death in thyroid cancer: a population based study of 2479 cases from Norway. Cancer Res 1991; 51: 1234-1241

14. U.S. Preventive Services Task Force: Guide to Clinical Preventive Services: an Assessment of the Effectiveness of 169 Interventions. Williams & Wilkins, Baltimore, Md, 1989: 105-110