“…First there is a rare juvenile group in whom a genetic abnormality causes depleted production of intrinsic factor and resulting megaloblastic anaemia in the absence of gastric atrophy (Reisner, Wolff, McKay, and Doyle, 1951;Mollin, Baker, and Doniach, 1955;Harris-Jones, Swan, and Tudhope, 1957;Clement, Nichol, and Welch, 1961).…”