1)Snijders AH, et al : Neurological gait disorders in elderly people ; clinical approach and classification. Lancet Neurol 6(1): 63-74, 2007.
2)Jahn K, et al : Gait disturbances in old age ; classification, diagnosis, and treatment from a neurological perspective. Dtsch Arztebl Int 107(17): 306-315, 2010.
3)Berkowitz AL, et al : Clinical reasoning ; an 85-year-old man with paresthesias and an unsteady gait. Neurology 80(12): e120-126, 2013.
4)Kumar N : Neurologic aspects of cobalamin(B12) deficiency. Handb Clin Neurol 120 : 915-926, 2014.
5)Jain KK, et al : Prevalence of MR imaging abnormalities in vitamin B12 deficiency patients presenting with clinical features of subacute combined degeneration of the spinal cord. J Neurol Sci 342(1-2): 162-166, 2014.
6)Xiao CP, et al : Conventional MRI for diagnosis of subacute combined degeneration(SCD)of the spinal cord due to vitamin B-12 deficiency. Asia Pac J Clin Nutr 25(1): 34-38, 2016.
7)Saperstein DS, et al : Challenges in the identification of cobalamin-deficiency polyneuropathy. Arch Neurol 60(9): 1296-1301, 2003.
8)Healton EB, et al : Neurologic aspects of cobalamin deficiency. Medicine(Baltimore)70(4): 229-245, 1991.
9)Reynolds E : Vitamin B12, folic acid, and the nervous system. Lancet Neurol 5(11): 949-960, 2006.
10)Andrès E, et al : B12 deficiency ; a look beyond pernicious anemia. J Fam Pract 56(7): 537-542, 2007.
11)Dali-Youcef N, et al : An update on cobalamin deficiency in adults. QJM 102(1): 17-28, 2009.
12)Hunt A, et al : Vitamin B12 deficiency. BMJ 349 : g5226, 2014.
13)Andrès E, et al : Vitamin B12(cobalamin) deficiency in elderly patients. CMAJ 171(3): 251-259, 2004.
14)Andrès E, et al : Food-cobalamin malabsorption in elderly patients ; clinical manifestations and treatment. Am J Med 118(10): 1154-1159, 2005.
15)Kumar N : Copper deficiency myelopathy(human swayback). Mayo Clin Proc 81(10): 1371-1384, 2006.
16)Huff JD, et al : Copper deficiency causes reversible myelodysplasia. Am J Hematol 82(7): 625-630, 2007.
17)Verma R, et al : Study of micronutrients(copper, zinc and vitamin B12) in posterolateral myelopathies. J Neurol Sci 329(1-2): 11-16, 2013.