Van der Wielen RPJ, Lowik MRH, van der Berg H, de Groot LCPGM, Haller J, Moreiras O, van Staveren WA: Serum vitamin D concentration among elderly people in Europe. Lancet. 1995, 346: 207-10. 10.1016/S0140-6736(95)91266-5.
Article
CAS
PubMed
Google Scholar
McKenna MJ: Differences in vitamin D status between countries in young adults and the elderly. Am J Med. 1992, 93: 69-77. 10.1016/0002-9343(92)90682-2.
Article
CAS
PubMed
Google Scholar
Lips P: Vitamin deficiency and secondary hyperparathyroidism in the elderly: consequences for bone loss and fractures and therapeutic implications. Endoc Rev. 2001, 22: 477-501. 10.1210/er.22.4.477.
Article
CAS
Google Scholar
Holick MF: Vitamin D deficiency. N Engl J Med. 2007, 357: 266-281. 10.1056/NEJMra070553.
Article
CAS
PubMed
Google Scholar
Lips P, Duong T, Oleksik A, Black D, Cummings S, Cox D, Nickelsen T: A global study of vitamin D status and parathyroid function in postmenopausal women with osteoporosis: baseline data from the multiple outcomes of raloxifene evaluation clinical trial. J Clin Endocrinol Metab. 2001, 86: 1212-1221. 10.1210/jc.86.3.1212.
Article
CAS
PubMed
Google Scholar
Saraiva GL, Cendoroglo MS, Ramos LR, Araújo LM, Vieira JGH, Kunii IS, Hayashi LF, de Paula CM, Lazaretti Castro M: Influence of ultraviolet radiation on the production of 25 hydroxyvitamin D in the elderly population in the city of São Paulo (23°34’S), Brazil. Osteoporos Int. 2005, 16 (12): 1649-1654. 10.1007/s00198-005-1895-3.
Article
CAS
PubMed
Google Scholar
Saraiva GL, Cendoroglo MS, Ramos LR, Araújo LM, Vieira JGH, Maeda SS, Borba VZC, Kunii IS, Hayashi LF, Lazaretti Castro M: Prevalência da deficiência, insuficiência de vitamina D e hiperparatireoidismo secundário em idosos institucionalizados e moradores da cidade de São Paulo, Brasil. Arq Bras Endocrinol Metab. 2007, 51 (3): 437-442. 10.1590/S0004-27302007000300012.
Article
Google Scholar
Ramos LR, Toniolo Neto J, Cendoroglo MS, Garcia JT, Najas M, Perracini M, Paola C, Santos F, Bilton TL, Ebel S, Macedo MBM, Almada Filho CM, Nasri F, Miranda RD, Gonçalves M, Santos A, Fraieta R, Vivacqua I, Alves M, Tudisco E: Two-year follow-up study of elderly residents in São Paulo, Brazil: methodology and preliminary results. J Public Health. 1998, 32: 397-407.
CAS
Google Scholar
Maeda SS, Kunii IS, Hayashi LF, Lazaretti-Castro M: Increases in summer serum 25-hydroxyvitamin D (25OHD) concentrations in elderly subjects in São Paulo, Brazil vary with age, gender and ethnicity. BMC Endocrine Disord. 2010, 10: 12-10.1186/1472-6823-10-12.
Article
Google Scholar
Maeda SS, Kunii IS, Hayashi LF, Lazaretti-Castro M: The effect of the sun exposure on 25 hydroxyvitamin D concentrations in young health subjects living in the city of São Paulo, Brazil. Braz J Med Biol Res. 2007, 40 (12): 1653-1659. 10.1590/S0100-879X2006005000162.
Article
CAS
PubMed
Google Scholar
Vieira JGH, Nishida SK, Kasamatsu TS, Amarante EC, Kunii IS: Development and clinical application of an immunofluorimetric assay for intact parathyroid hormone. Braz J Med Biol Res. 1994, 27: 2379-2382.
CAS
PubMed
Google Scholar
Cockroft D, Gault H: Prediction of creatinine clearence from serum creatinine. Nephron. 1976, 16: 31-41. 10.1159/000180580.
Article
Google Scholar
Mithal A, Wahl DA, Bonjour JP, Burckhardt P, Dawson-Hughes B, Eisman JA, El-Hajj Fuleihan G, Josse RG, Lips P, Morales-Torres J, IOF Committee of Scientific Advisors (CSA) Nutrition Working Group: Global vitamin D status and determinants of hypovitaminosis D. Osteoporos Int. 2009, 20 (11): 1807-20. 10.1007/s00198-009-0954-6.
Article
CAS
PubMed
Google Scholar
Wahl DA, Cooper C, Ebeling PR, Eggersdorfer M, Hilger J, Hoffmann K, Josse R, Kanis JA, Mithal A, Pierroz DD, Stenmark J, Stöcklin E, Dawson-Hughes B: A global representation of vitamin D status in healthy populations. Arch Osteoporos. 2012, 7 (1–2): 155-72.
Article
CAS
PubMed
Google Scholar
Henir-Manicourt D, Devogalaer JP: Urban troposferic ozone increases the prevalence of vitamin D deficiency among Belgian postmenopausal women with outodoor activities during summer. J Clin Endocrinol Metab. 2008, 93 (10): 3893-3899. 10.1210/jc.2007-2663.
Article
Google Scholar
Sherman SS, Hollis BW, Tobin JD: Vitamin D status and related parameters in a healthy population: the effects of age, sex and season. J Clin Endocrinol Metab. 1990, 71: 405-413. 10.1210/jcem-71-2-405.
Article
CAS
PubMed
Google Scholar
Dawson-Hughes B, Harris SS, Dallal GE: Plasma calcidiol, season, and serum parathyroid hormone concentration in healthy elderly men and women. Am J Clin Nutr. 1997, 65: 67-71.
CAS
PubMed
Google Scholar
Stryd RP, Gilbertson TJ, Brunden MN: A seasonal variation study of 25-hydroxyvitamin D3 serum levels in normal humans. J Clin Endocrinol Metab. 1979, 48: 771-5. 10.1210/jcem-48-5-771.
Article
CAS
PubMed
Google Scholar
Pasco JA, Henry MJ, Kotowicz MA, Sanders KM, Seeman E, Pasco JR, Schneider HG, Nicholson GC: Seasonal periodicity of serum vitamin D and parathyroid hormone, bone resorption, and fractures: the Geelong osteoporosis study. J Bone Miner Res. 2004, 19 (5): 752-758. 10.1359/jbmr.040125.
Article
CAS
PubMed
Google Scholar
Gannagé-Yared MH, Chemali R, Yaacoub N, Halaby G: Hypovitaminosis D in a sunny country: relation to lifestyle and bone markers. J Bone Miner Res. 2000, 15 (9): 1856-62. 10.1359/jbmr.2000.15.9.1856.
Article
PubMed
Google Scholar
Lips P, Hackeng WHL, Jongen MJM, Ginkel van FC, Netelenbos JC: Seasonal variation in serum concentrations of parathyroid hormone in elderly people. J Clin Endoc Metab. 1983, 57: 204-6. 10.1210/jcem-57-1-204.
Article
CAS
Google Scholar
Tangpricha V, Pearce EN, Chen TC, Holick MF: Vitamin D insufficiency among free-living healthy young adults. Am J Med. 2002, 112 (suppl 8): 659-662.
Article
CAS
PubMed
PubMed Central
Google Scholar
MacLaughlin J, Holick MF: Aging decreases the capacity of human skin to produce vitamin D3. J Clin Invest. 1985, 76: 1536-8. 10.1172/JCI112134.
Article
CAS
PubMed
PubMed Central
Google Scholar
Vieth R, Ladak Y, Walfish PG: Age-related changes in the 25-hydroxyvitamin D versus parathyroid hormone relationship suggest a different reason why older adults require more Vitamin D. J Clin Endocrinol Metab. 2003, 88 (1): 185-191. 10.1210/jc.2002-021064.
Article
CAS
PubMed
Google Scholar
Souberbielle JC, Cormier C, Kindermans C, Gao P, Cantor T, Forette F, Baulieu EE: Vitamin D status and redefining serum parathyroid hormone reference range in the elderly. J Clin Endocrinol Metab. 2001, 86: 3086-3090. 10.1210/jc.86.7.3086.
CAS
PubMed
Google Scholar
Chapuy MC, Preziosi P, Maamer M, Arnaud S, Galan P, Hercberg S, Meunier PJ: Prevalence of Vitamin D insufficiency in an adult normal population. Osteoporos Int. 1997, 7: 439-443. 10.1007/s001980050030.
Article
CAS
PubMed
Google Scholar
Dawson-Hughes B, Heaney RP, Holick MF, Lips P, Meunier PJ, Vieth R: Estimates of optimal vitamin D status. Osteoporos Int. 2005, 16: 713-716. 10.1007/s00198-005-1867-7.
Article
CAS
PubMed
Google Scholar
Utiger R: The need for more Vitamin D. N Engl J Med. 1998, 338 (12): 828-9. 10.1056/NEJM199803193381209.
Article
CAS
PubMed
Google Scholar
Gloth FM, Tobin JD: Vitamin D deficiency in older people. JAGS. 1995, 43: 822-8.
Article
Google Scholar
Freaney R, McBrinn Y, McKenna MJ: Secondary hyperparathyroidism in elderly people: combined effect of renal insufficiency and vitamin D deficiency. Am J Clin Nutr. 1993, 58: 187-191.
CAS
PubMed
Google Scholar
Need AG, Horowitz M, Morris HA, Nordin BC: Vitamin D status: effects on parathyroid hormone and 1, 25-dihydroxyvitamin D in postmenopausal women. Am J Clin Nutr. 2000, 71 (6): 1577-81.
CAS
PubMed
Google Scholar
Adami S, Viapiana O, Gatti D, Idolazzi L, Rossini M: Relationship between serum parathyroid hormone, vitamin D sufficiency, age, and calcium intake. Bone. 2008, 42 (2): 267-70. 10.1016/j.bone.2007.10.003.
Article
CAS
PubMed
Google Scholar
Steingrimsdottir L, Gunnarsson O, Indridason OS, Franzson L, Sigurdsson G: Relationship between serum parathyroid hormone levels, vitamin D sufficiency, and calcium intake. JAMA. 2005, 294 (18): 2336-41. 10.1001/jama.294.18.2336.
Article
CAS
PubMed
Google Scholar
Bischoff-Ferrari H: Vitamin D: what is an adequate vitamin D level and how much supplementation is necessary?. Best Pract Res Clin Rheumatol. 2009, 26 (6): 789-95.
Article
Google Scholar
Holick MF, Binkley NC, Bischoff-Ferrari HA, Gordon CM, Hanley DA, Heaney RP, Murad MH, Weaver, Endocrine Society: Evaluation, treatment, and prevention of vitamin D deficiency: an endocrine society clinical practice guideline. JCEM. 2011, 96 (7): 1911-30.
CAS
PubMed
Google Scholar