[1] Pearce EN, Lazarus JH, Moreno-Reyes R, et al. Consequences of iodine deficiency and excess in pregnant women:an overview of current knowns and unknowns. Am J Clin Nutr, 2016; 104, 918-23. doi:  10.3945/ajcn.115.110429
[2] Rasmussen LB, Ovesen L, Christiansen E. Day-to-day and within-day variation in urinary iodine excretion. Eur J Clin Nutr, 1999; 53, 401-7. doi:  10.1038/sj.ejcn.1600762
[3] WHO. Assessment of Iodine Deficiency Disorders and Monitoring Their Elimination. A Guide for Programme Managers. Geneva:WHO, 2007.
[4] Remer T, Fonteyn N, Alexy U, et al. Longitudinal examination of 24-h urinary iodine excretion in schoolchildren as a sensitive, hydration status-independent research tool for studying iodine status. Am J Clin Nutr, 2006; 83, 639-46. doi:  10.1093/ajcn.83.3.639
[5] Kawasaki T, Itoh K, Uezono K, et al. A simple method for estimating 24 h urinary sodium and potassium excretion from second morning voiding urine specimen in adults. Clin Exp Pharmacol Physiol, 1993; 20, 7-14. doi:  10.1111/cep.1993.20.issue-1
[6] Dunn JT, Crutchfield HE, Gutekunst R, et al. Two simple methods for measuring iodine in urine. Thyroid, 1993; 3, 119-23. doi:  10.1089/thy.1993.3.119
[7] Kesteloot H, Joossens J. On the determinants of the creatinine clearance:a population study. J Hum Hypertens, 1996; 10, 245-9. http://europepmc.org/abstract/MED/8736456
[8] Tanaka T, Okamura T, Miura K, et al. A simple method to estimate populational 24-h urinary sodium and potassium excretion using a casual urine specimen. J Hum Hypertens, 2002; 16, 97-103. doi:  10.1038/sj.jhh.1001307
[9] Mage DT, Allen RH, Kodali A. Creatinine corrections for estimating children's and adult's pesticide intake doses in equilibrium with urinary pesticide and creatinine concentrations. J Expo Sci Environ Epidemiol, 2007; 18, 360. http://europepmc.org/abstract/MED/17878925
[10] Li CY, Peng S, Zhang XM, et al. The urine iodine to creatinine as an optimal index of iodine during pregnancy in an iodine adequate area in China. J Clin Endocr Metab, 2016; 101, 1290-8. doi:  10.1210/jc.2015-3519