Fried, M. Hainer, V. Basdevant, A. Buchwald, H. Deitel, M. Finer, N. Greve, J. W. M. Horber, F. Mathus-Vliegen, E. Scopinaro, N. Steffen, R. Tsigos, C. Weiner, R. and Widhalm, K., Inter-disciplinary European guidelines on surgery of severe obesity, International Journal of Obesity Supplements, (31), 569-577, 2007, SPRINGERNATURE, 2046-2166, 2046-2174