[1]Karthikayan A, Sureshkumar S, Kadambari D, et al. Low serum 25-hydroxy vitamin D levels are associated with aggressive breast cancer variants and poor prognostic factors in patients with breast carcinoma [J]. Arch Endocrinol Metab, 2018,62:452-459. [2]Chen P, Li M, Gu X, et al. Higher blood 25OHD level may reduce the breast cancer risk: evidence from a Chinese population based case-control study and meta-analysis of the observational studies [J]. PLoS One, 2013,8:e49312.doi:10.1371/journal.pone.0049312. [3]Akdere G, Efe B, Sisman P, et al. The relationship between vitamin D level and organ-specific autoimmune disorders in newly diagnosed type I diabetes mellitus [J]. Bratisl Lek Listy, 2018,119:544-549. [4]Afzal S, Bojesen SE, Nordestgaard BG. Low 25-hydroxy-vitamin D and risk of type 2 diabetes: a prospective cohort study and meta-analysis [J]. Clin Chem, 2013,59:381-391. [5]Fu J, Han L, Zhao Y, et al. Vitamin D levels are associated with metabolic syndrome in adolescents and young adults: the BCAMS study [J]. Clin Nutr, 2018.doi: 10.1016/j.clnu.2018.08.039. [6]Tagliaferri S, Porri D, De Giuseppe R, et al. The controversial role of vitamin D as an antioxidant: results from randomised controlled trials [J]. Nutr Res Rev, 2018,32:99-105. [7]Yu S, Zhang R, Zhou W, et al. Is it necessary for all samples to quantify 25OHD2 and 25OHD3 using LC-MS/MS in clinical practice? [J] Clin Chem Lab Med, 2018,56:273-277. [8]Kennel KA, Drake MT, Hurley DL. Vitamin D deficiency in adults: when to test and how to treat [J]. Mayo Clin Proc, 2010,85:752-758. [9]Klingberg E, Oleröd G, Konar J, et al. Seasonal variations in serum 25-hydroxy vitamin D levels in a Swedish cohort [J]. Endocrine, 2015,49:800-808. [10]Niculescu DA, Capatina CA, Dusceac R, et al. Seasonal variation of serum vitamin D levels in Romania [J]. Arch Osteoporos, 2017,12:113. [11]Das G, Taylor PN, Javaid H, et al. Seasonal variation of vitamin D and serum thyrotropin levels and its relationship in a euthyroid caucasian population [J]. Endocr Pract, 2018,24:53-59. [12]Andersen R, Mølgaard C, Skovgaard LT, et al. Teenage girls and elderly women living in northern Europe have low winter vitamin D status [J]. Eur J Clin Nutr, 2005,59:533-541. |