1. Strazzullo P, D'Elia L, Kandala NB, Cappuccio FP. Salt intake, stroke, and cardiovascular disease: meta-analysis of prospective studies. BMJ. 2009; 339:b4567.
2. He FJ, MacGregor GA. Salt, blood pressure and cardiovascular disease. Curr Opin Cardiol. 2007; 22:298–305.
3. Intersalt Cooperative Research Group. Intersalt: an international study of electrolyte excretion and blood pressure. Results for 24 hour urinary sodium and potassium excretion. BMJ. 1988; 297:319–328.
4. World Health Organization. Guideline: Sodium intake for adults and children. Geneva, Switzerland: World Health Organization;2012.
5. Stolarz-Skrzypek K, Kuznetsova T, Thijs L, et al. Fatal and nonfatal outcomes, incidence of hypertension, and blood pressure changes in relation to urinary sodium excretion. JAMA. 2011; 305:1777–1785.
6. O'Donnell MJ, Yusuf S, Mente A, et al. Urinary sodium and potassium excretion and risk of cardiovascular events. JAMA. 2011; 306:2229–2238.
7. O'Donnell M, Mente A, Rangarajan S, et al. Urinary sodium and potassium excretion, mortality, and cardiovascular events. N Engl J Med. 2014; 371:612–623.
8. Elliott P, Stamler J, Nichols R, et al. Intersalt Cooperative Research Group. Intersalt revisited: further analyses of 24 hour sodium excretion and blood pressure within and across populations. BMJ. 1996; 312:1249–1253.
9. Khaw KT, Bingham S, Welch A, et al. Blood pressure and urinary sodium in men and women: the Norfolk Cohort of the European Prospective Investigation into Cancer (EPIC-Norfolk). Am J Clin Nutr. 2004; 80:1397–1403.
10. MacGregor GA, Markandu ND, Best FE, et al. Double-blind randomised crossover trial of moderate sodium restriction in essential hypertension. Lancet. 1982; 1:351–355.
11. Sacks FM, Svetkey LP, Vollmer WM, et al. DASH-Sodium Collaborative Research Group. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. N Engl J Med. 2001; 344:3–10.
12. Karppanen H, Mervaala E. Sodium intake and hypertension. Prog Cardiovasc Dis. 2006; 49:59–75.
13. Graudal NA, Hubeck-Graudal T, Jürgens G. Effects of low-sodium diet vs. high-sodium diet on blood pressure, renin, aldosterone, catecholamines, cholesterol, and triglyceride (Cochrane Review). Am J Hypertens. 2012; 25:1–15.
14. He FJ, Li J, Macgregor GA. Effect of longer term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials. BMJ. 2013; 346:f1325.
15. The effects of nonpharmacologic interventions on blood pressure of persons with high normal levels. Results of the Trials of Hypertension Prevention, Phase I. JAMA. 1992; 267:1213–1220.
16. The Trials of Hypertension Prevention Collaborative Research Group. Effects of weight loss and sodium reduction intervention on blood pressure and hypertension incidence in overweight people with high-normal blood pressure. The Trials of Hypertension Prevention, phase II. Arch Intern Med. 1997; 157:657–667.
17. Cook NR, Cutler JA, Obarzanek E, et al. Long term effects of dietary sodium reduction on cardiovascular disease outcomes: observational follow-up of the trials of hypertension prevention (TOHP). BMJ. 2007; 334:885–888.
18. Taylor RS, Ashton KE, Moxham T, Hooper L, Ebrahim S. Reduced dietary salt for the prevention of cardiovascular disease: a meta-analysis of randomized controlled trials (Cochrane review). Am J Hypertens. 2011; 24:843–853.
19. Taylor RS, Ashton KE, Moxham T, Hooper L, Ebrahim S. WITHDRAWN: Reduced dietary salt for the prevention of cardiovascular disease. Cochrane Database Syst Rev. 2013; 9:CD009217.
20. Alderman MH. Reducing dietary sodium: the case for caution. JAMA. 2010; 303:448–449.
21. He FJ, MacGregor GA. Salt reduction lowers cardiovascular risk: meta-analysis of outcome trials. Lancet. 2011; 378:380–382.
22. Whelton PK, Appel LJ, Espeland MA, et al. TONE Collaborative Research Group. Sodium reduction and weight loss in the treatment of hypertension in older persons: a randomized controlled trial of nonpharmacologic interventions in the elderly (TONE). JAMA. 1998; 279:839–846.
23. Paterna S, Gaspare P, Fasullo S, Sarullo FM, Di Pasquale P. Normal-sodium diet compared with low-sodium diet in compensated congestive heart failure: is sodium an old enemy or a new friend? Clin Sci (Lond). 2008; 114:221–230.
24. Morimoto A, Uzu T, Fujii T, et al. Sodium sensitivity and cardiovascular events in patients with essential hypertension. Lancet. 1997; 350:1734–1737.
25. Weinberger MH, Fineberg NS, Fineberg SE, Weinberger M. Salt sensitivity, pulse pressure, and death in normal and hypertensive humans. Hypertension. 2001; 37(2 Pt 2):429–432.
26. Franco V, Oparil S. Salt sensitivity, a determinant of blood pressure, cardiovascular disease and survival. J Am Coll Nutr. 2006; 25:3 Suppl. 247S–255S.
27. Shin SJ, Lim CY, Rhee MY, et al. Characteristics of sodium sensitivity in Korean populations. J Korean Med Sci. 2011; 26:1061–1067.
28. Metoki H, Ohkubo T, Kikuya M, et al. Prognostic significance for stroke of a morning pressor surge and a nocturnal blood pressure decline: the Ohasama study. Hypertension. 2006; 47:149–154.
29. Kario K, Pickering TG, Umeda Y, et al. Morning surge in blood pressure as a predictor of silent and clinical cerebrovascular disease in elderly hypertensives: a prospective study. Circulation. 2003; 107:1401–1406.
30. Rhee MY, Lim CY, Shin SJ, et al. Elevation of morning blood pressure in sodium resistant subjects by high sodium diet. J Korean Med Sci. 2013; 28:555–563.
31. Alderman MH, Madhavan S, Ooi WL, Cohen H, Sealey JE, Laragh JH. Association of the renin-sodium profile with the risk of myocardial infarction in patients with hypertension. N Engl J Med. 1991; 324:1098–1104.
32. de Boer RA, Schroten NF, Bakker SJ, et al. Plasma renin and outcome in the community: data from PREVEND. Eur Heart J. 2012; 33:2351–2359.
33. Verma S, Gupta M, Holmes DT, et al. Plasma renin activity predicts cardiovascular mortality in the Heart Outcomes Prevention Evaluation (HOPE) study. Eur Heart J. 2011; 32:2135–2142.
34. Brunner HR, Laragh JH, Baer L, et al. Essential hypertension: renin and aldosterone, heart attack and stroke. N Engl J Med. 1972; 286:441–449.
35. Grassi G, Dell'Oro R, Seravalle G, Foglia G, Trevano FQ, Mancia G. Short- and long-term neuroadrenergic effects of moderate dietary sodium restriction in essential hypertension. Circulation. 2002; 106:1957–1961.
36. Alderman MH, Madhavan S, Cohen H, Sealey JE, Laragh JH. Low urinary sodium is associated with greater risk of myocardial infarction among treated hypertensive men. Hypertension. 1995; 25:1144–1152.
37. Tikellis C, Pickering RJ, Tsorotes D, et al. Activation of the Renin-Angiotensin system mediates the effects of dietary salt intake on atherogenesis in the apolipoprotein E knockout mouse. Hypertension. 2012; 60:98–105.
38. Kotchen TA, Cowley AW Jr, Frohlich ED. Salt in health and disease--a delicate balance. N Engl J Med. 2013; 368:1229–1237.
39. Rhee MY, Kim JH, Shin SJ, Lim CY, Kim SW, Nah DY. Relationship between plasma renin activity and 24-hour urinary sodium excretion: low sodium intake is dangerous by elevation of renin? Eur Heart J. 2013; 34:1117. Abstract.
40. Espeland MA, Kumanyika S, Wilson AC, et al. Statistical issues in analyzing 24-hour dietary recall and 24-hour urine collection data for sodium and potassium intakes. Am J Epidemiol. 2001; 153:996–1006.
41. Brown IJ, Tzoulaki I, Candeias V, Elliott P. Salt intakes around the world: implications for public health. Int J Epidemiol. 2009; 38:791–813.
42. Kwon YJ, Rhee MY, Kim JY, et al. Differences between analyzed and estimated sodium contents of food composition table or food exchange list. J Korean Soc Food Sci Nutr. 2010; 39:535–541.
43. James WP, Ralph A, Sanchez-Castillo CP. The dominance of salt in manufactured food in the sodium intake of affluent societies. Lancet. 1987; 1:426–429.
44. Mattes RD, Donnelly D. Relative contributions of dietary sodium sources. J Am Coll Nutr. 1991; 10:383–393.
45. Leiba A, Vald A, Peleg E, Shamiss A, Grossman E. Does dietary recall adequately assess sodium, potassium, and calcium intake in hypertensive patients? Nutrition. 2005; 21:462–466.
46. Reinivuo H, Valsta LM, Laatikainen T, Tuomilehto J, Pietinen P. Sodium in the Finnish diet: II trends in dietary sodium intake and comparison between intake and 24-h excretion of sodium. Eur J Clin Nutr. 2006; 60:1160–1167.
47. Stamler J, Elliott P, Chan Q. INTERMAP Research Group. INTERMAP appendix table, tables of contents (tables A). J Hum Hypertens. 2003; 17:665–758.
48. Yoshita K, Miura K, Okayama A, et al. A validation study on food composition tables for the international cooperative INTERMAP study in Japan. Environ Health Prev Med. 2005; 10:150–156.
49. Holbrook JT, Patterson KY, Bodner JE, et al. Sodium and potassium intake and balance in adults consuming self-selected diets. Am J Clin Nutr. 1984; 40:786–793.
50. Kirby CR, Convertino VA. Plasma aldosterone and sweat sodium concentrations after exercise and heat acclimation. J Appl Physiol (1985). 1986; 61:967–970.
51. Luft FC, Fineberg NS, Sloan RS. Estimating dietary sodium intake in individuals receiving a randomly fluctuating intake. Hypertension. 1982; 4:805–808.
52. Liu K, Cooper R, McKeever J, et al. Assessment of the association between habitual salt intake and high blood pressure: methodological problems. Am J Epidemiol. 1979; 110:219–226.
53. World Health Organization. Reducing Salt Intake in Populations: Report of a WHO Forum and Technical Meeting. Paris, France: World Health Organization;2007.
54. The INTERSALT Co-operative Research Group. INTERSALT Study an international co-operative study on the relation of blood pressure to electrolyte excretion in populations. I. Design and methods. J Hypertens. 1986; 4:781–787.
55. Bingham S, Cummings JH. The use of 4-aminobenzoic acid as a marker to validate the completeness of 24 h urine collections in man. Clin Sci (Lond). 1983; 64:629–635.
56. National Centre for Social Research. An assessment of dietary sodium levels among adults (aged 19-64) in the UK general population in 2008, based on analysis of dietary sodium in 24 hour urine samples. UK, London: Food Standards Agency;2008.
57. Scottish Centre for Social Research. A survey of 24-hour urinary sodium excretion in a representative sample of the Scottish population as a measure of salt intake. London, UK: Scottish Centre for Social Research;2011.
58. Henderson L, Irving K, Gregory J, et al. National Diet and Nutrition Survey:
adults aged 19 to 64 years. Volume 3: Vitamin and mineral intake and urinary analytes. London: TSO;2003.
59. Lykken GI, Jacob RA, Munoz JM, Sandstead HH. A mathematical model of creatine metabolism in normal males--comparison between theory and experiment. Am J Clin Nutr. 1980; 33:2674–2685.
60. Forbes GB, Bruining GJ. Urinary creatinine excretion and lean body mass. Am J Clin Nutr. 1976; 29:1359–1366.
61. Knuiman JT, Hautvast JG, van der Heyden L, et al. A multi-centre study on completeness of urine collection in 11 European centres. I. Some problems with the use of creatinine and 4-aminobenzoic acid as markers of the completeness of collection. Hum Nutr Clin Nutr. 1986; 40:229–237.
62. Laatikainen T, Pietinen P, Valsta L, Sundvall J, Reinivuo H, Tuomilehto J. Sodium in the Finnish diet: 20-year trends in urinary sodium excretion among the adult population. Eur J Clin Nutr. 2006; 60:965–970.
63. Polónia J, Maldonado J, Ramos R, et al. Estimation of salt intake by urinary sodium excretion in a Portuguese adult population and its relationship to arterial stiffness. Rev Port Cardiol. 2006; 25:801–817.
64. Ortega RM, López-Sobaler AM, Ballesteros JM, et al. Estimation of salt intake by 24 h urinary sodium excretion in a representative sample of Spanish adults. Br J Nutr. 2011; 105:787–794.
65. Ribič CH, Zakotnik JM, Vertnik L, Vegnuti M, Cappuccio FP. Salt intake of the Slovene population assessed by 24 h urinary sodium excretion. Public Health Nutr. 2010; 13:1803–1809.
66. Rhee MY, Shin SJ, Park SH, Kim SW. Sodium intake of a city population in Korea estimated by 24-h urine collection method. Eur J Clin Nutr. 2013; 67:875–880.
67. Murakami K, Sasaki S, Takahashi Y, et al. Sensitivity and specificity of published strategies using urinary creatinine to identify incomplete 24-h urine collection. Nutrition. 2008; 24:16–22.
68. Survey for natrium intake, and analysis of the relationship between natrium intake and health by urine collection method. Osong, Korea: Korea Ministry of Food and Drug Safety;2012.
69. Hawkes C, Webster J. National approaches to monitoring population salt intake: a trade-off between accuracy and practicality? PLoS One. 2012; 7:e46727.
70. Kawasaki T, Itoh K, Uezono K, Sasaki H. 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.
71. 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.
72. Brown IJ, Dyer AR, Chan Q, et al. Estimating 24-hour urinary sodium excretion from casual urinary sodium concentrations in Western populations: the INTERSALT study. Am J Epidemiol. 2013; 177:1180–1192.
73. Mann SJ, Gerber LM. Estimation of 24-hour sodium excretion from spot urine samples. J Clin Hypertens (Greenwich). 2010; 12:174–180.
74. Park S, Park JB, Lakatta EG. Association of central hemodynamics with estimated 24-h urinary sodium in patients with hypertension. J Hypertens. 2011; 29:1502–1507.
75. Mente A, O'Donnell MJ, Dagenais G, et al. Validation and comparison of three formulae to estimate sodium and potassium excretion from a single morning fasting urine compared to 24-h measures in 11 countries. J Hypertens. 2014; 32:1005–1014. discussion 1015.
76. Stanbury SW, Thomson AE. Diurnal variation in electrolyte excretion. Clin Sci (Lond). 1951; 10:267–293.
77. Yamori Y, Kihara M, Fujikawa J, et al. Dietary risk factors of stroke and hypertension in Japan -- Part 1: Methodological assessment of urinalysis for dietary salt and protein intakes. Jpn Circ J. 1982; 46:933–938.
78. Yamori Y, Kihara M, Fujikawa J, et al. Dietary risk factors of stroke and hypertension in Japan -- Part 2: Validity of urinalysis for dietary salt and protein intakes under a field condition. Jpn Circ J. 1982; 46:939–943.
79. Wesson LG Jr. Electrolyte excretion in relation to diurnal cycles of renal function. Medicine (Baltimore). 1964; 43:547–592.
80. Kawamura M, Kawasaki T. Clinical application of the second morning urine method for estimating salt intake in patients with hypertension. Clin Exp Hypertens. 2014; [Epub ahead of print].
http://dx.doi:10.3109/10641963.2014.913601.
81. Bland JM, Altman DG. Comparing methods of measurement: why plotting difference against standard method is misleading. Lancet. 1995; 346:1085–1087.
82. Hanneman SK. Design, analysis, and interpretation of method-comparison studies. AACN Adv Crit Care. 2008; 19:223–234.
83. Bland JM, Altman DG. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet. 1986; 1:307–310.
84. Ji C, Miller MA, Venezia A, Strazzullo P, Cappuccio FP. Comparisons of spot vs 24-h urine samples for estimating population salt intake: validation study in two independent samples of adults in Britain and Italy. Nutr Metab Cardiovasc Dis. 2014; 24:140–147.
85. Rhee MY, Kim JH, Shin SJ, et al. Estimation of 24-hour urinary sodium excretion using spot urine samples. Nutrients. 2014; 6:2360–2375.