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2. The geographic hypothesis and lactose malabsorption: a weighing of the evidence;Simmons, F.J.;Dig Dis,1978
3. The diagnosis, incidence and significance of disaccharidase;Neal, G.,1968
4. Lactose intolerance in Greeks;Spanidou, E.P.; Petrakis, N.L.;Lancet,1972
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