S. Santoro, M. C. P. Velhote, C. E. Malzoni, F. Q. Milleo, S. Klajner, and F. G. Campos, “Preliminary results from digestive adaptation: a new surgical proposal for treating obesity, based on physiology and evolution”, Sao Paulo Med J, vol. 124, no. 4, pp. 192–197, Jul. 2006.