Why cant I see in the dark?
BMJ 373:m1573, Khan, S.,et al, 2021
Vitamin B12 Deficiency in a 29-Year-Old Woman
Neurol 97:e643-e646, Huddar, A.,et al, 2021
Clinopathologic Conference, Celiac Disease
NEJM 374:1875-1883, Case 14-2016, 2016
A Man with Weight Loss, Ataxia, and Confusion for 3 Months
Lancet 347:448, Beversdorf,D.,et al, 1996