R. Bibliographiques-1, E. Eschwege, A. Basdevant, A. Crine, C. Moisan et al., Type 2 diabetes mellitus in France in 2012: results from the ObEpi survey, Diabetes Metab, vol.41, pp.55-61, 2015.

S. Bellentani, G. Saccoccio, and F. Masutti, Prevalence of and Risk Factors for Hepatic Steatosis in Northern Italy, Annals of Internal Medicine, vol.132, issue.2, pp.112-119, 2000.
DOI : 10.7326/0003-4819-132-2-200001180-00004

N. Chalasani, Z. Younossi, and J. Lavine, The diagnosis and management of non-alcoholic fatty liver disease: Practice Guideline by the American Association for the Study of Liver Diseases, American College of Gastroenterology, and the American Gastroenterological Association, Hepatology, vol.112, issue.17, pp.2005-2028, 2012.
DOI : 10.1002/hep.25762

G. Vernon, A. Baranova, and Z. Younossi, Systematic review: the epidemiology and natural history of non-alcoholic fatty liver disease and non-alcoholic steatohepatitis in adults, Alimentary Pharmacology & Therapeutics, vol.11, issue.6 Pt 2, pp.274-85, 2011.
DOI : 10.1111/j.1365-2036.2011.04724.x

V. Agopian, F. Kladas, and J. Hong, Liver Transplantation for Nonalcoholic Steatohepatitis, Annals of Surgery, vol.256, issue.4, pp.624-657, 2012.
DOI : 10.1097/SLA.0b013e31826b4b7e

E. Vilar-gomez and Y. Martinez-perez, Weight Loss Through Lifestyle Modification Significantly Reduces Features of Nonalcoholic Steatohepatitis, Gastroenterology, vol.149, issue.2, pp.367-78, 2015.
DOI : 10.1053/j.gastro.2015.04.005

S. Harrison, W. Fecht, and E. Brunt, Orlistat for overweight subjects with nonalcoholic steatohepatitis: A randomized, prospective trial, Hepatology, vol.40, issue.1, pp.80-86, 2009.
DOI : 10.1002/hep.22575

P. Schauer, D. Bhatt, and J. Kirwan, Bariatric Surgery versus Intensive Medical Therapy for Diabetes ??? 3-Year Outcomes, New England Journal of Medicine, vol.370, issue.21, pp.2002-2013, 2014.
DOI : 10.1056/NEJMoa1401329

G. Lasailly and R. Caiazzo, Bariatric Surgery Reduces Features of Nonalcoholic Steatohepatitis in Morbidly Obese Patients, Gastroenterology, vol.149, issue.2, pp.379-88, 2015.
DOI : 10.1053/j.gastro.2015.04.014

J. Mosko and G. Nguyen, Increased Perioperative Mortality Following Bariatric Surgery Among Patients With Cirrhosis, Clinical Gastroenterology and Hepatology, vol.9, issue.10, pp.897-901, 2011.
DOI : 10.1016/j.cgh.2011.07.007

D. Kleiner, P. Berk, J. Hsu, A. Courcoulas, D. Flum et al., Hepatic pathology among patients without known liver disease undergoing bariatric surgery: observations and a perspective from the longitudinal assessment of bariatric surgery (LABS) study, Semin Liver Dis, vol.34, pp.98-107, 2014.

F. Piccino and E. Sagnelli, Complications following percutaneous liver biopsy. A multicentre retrospective study on 68.276 biopsies, J Hepatol, vol.53, pp.165-73, 1986.

G. Colloredo, M. Guido, and A. Sonzogni, Impact of liver biopsy size on histological evaluation of chronic viral hepatitis: the smaller the sample, the milder the disease, Journal of Hepatology, vol.39, issue.2, pp.239-283, 2003.
DOI : 10.1016/S0168-8278(03)00191-0

V. Ratziu and F. Charlotte, Sampling Variability of Liver Biopsy in Nonalcoholic Fatty Liver Disease, Gastroenterology, vol.128, issue.7, pp.1898-906, 2005.
DOI : 10.1053/j.gastro.2005.03.084

S. Larson and S. Bowers, Histopathologic Variability Between the Right and Left Lobes of the Liver in Morbidly Obese Patients Undergoing Roux-en-Y Bypass, Clinical Gastroenterology and Hepatology, vol.5, issue.11, pp.1329-1361, 2007.
DOI : 10.1016/j.cgh.2007.06.005

N. Chalasani, Z. Younossi, J. Lavine, A. Diehl, E. Brunt et al., The Diagnosis and Management of Non-alcoholic Fatty Liver Disease: Practice Guideline by the American Gastroenterological Association, American Association for the Study of Liver Diseases, and American College of Gastroenterology, Diseases, and American College of Gastroenterology, pp.1592-609, 2012.
DOI : 10.1053/j.gastro.2012.04.001

V. Ratziu, S. Bellentani, H. Cortez-pinto, C. Day, and G. Marchesini, A position statement on NAFLD/NASH based on the EASL 2009 special conference, Journal of Hepatology, vol.53, issue.2, pp.372-84, 2010.
DOI : 10.1016/j.jhep.2010.04.008

M. Rousselet and S. Michalak, Sources of variability in histological scoring of chronic viral hepatitis, Hepatology, vol.20, issue.4Pt2, pp.257-64, 2005.
DOI : 10.1002/hep.20535

V. Wong, J. Vergniol, and G. Wong, Diagnosis of fibrosis and cirrhosis using liver stiffness measurements in non alcoholic fatty liver disease Schenzer NF, et al. Non invasive assessment and quantification of liver steatosis by ultrasound, computed tomography and magnetic resonance, Hepatology J Hepatol, vol.51, issue.51, pp.455-562433, 2009.

P. Angulo, The NAFLD fibrosis score: A noninvasive system that identifies liver fibrosis in patients with NAFLD, Hepatology, vol.41, issue.4, pp.846-54, 2007.
DOI : 10.1002/hep.21496

A. G. Shah, Development and validation of a simple NAFLD clinical scoring sytem for identifying patients without advanced disease Comparison of noninvasive markers of fibrosis in patients with non alcoholic fatty liver disease, Gut J Gastroenterol Hepatol, vol.57, issue.7, pp.1441-71104, 2008.

P. Cales, Comparison of blood tests for liver fibrosis specific or not to NAFLD, Journal of Hepatology, vol.50, issue.1, pp.165-73, 2009.
DOI : 10.1016/j.jhep.2008.07.035

L. Adams, Complex non-invasive fibrosis models are more accurate than simple models in non-alcoholic fatty liver disease, Journal of Gastroenterology and Hepatology, vol.25, issue.10, pp.1536-1579, 2011.
DOI : 10.1111/j.1440-1746.2011.06774.x

P. Angulo, D. Kleiner, and S. Dam-larsen, Liver Fibrosis, but No Other Histologic Features, Is Associated With Long-term Outcomes of Patients With Nonalcoholic Fatty Liver Disease, Gastroenterology, vol.149, issue.2, pp.389-97, 2015.
DOI : 10.1053/j.gastro.2015.04.043

M. Machado, P. Marques-vidal, and H. Cortez-pinto, Hepatic histology in obese patients undergoing bariatric surgery, Journal of Hepatology, vol.45, issue.4, pp.98-107, 2006.
DOI : 10.1016/j.jhep.2006.06.013

L. Castera, V. Vilgrain, and P. Angulo, Noninvasive evaluation of NAFLD, Nature Reviews Gastroenterology & Hepatology, vol.11, issue.11, pp.666-75, 2013.
DOI : 10.1136/gut.2010.214650

Y. Huang, L. Adams, and J. Joseph, The ability of Hepascore to predict liver fibrosis in chronic liver disease: a meta-analysis, Liver International, vol.53, issue.1, 2016.
DOI : 10.1111/liv.13116

T. Poynard, P. Mathurin, C. Lai, D. Guyader, R. Poupon et al., A comparison of fibrosis progression in chronic liver diseases, Journal of Hepatology, vol.38, issue.3, pp.257-65, 2003.
DOI : 10.1016/S0168-8278(02)00413-0

V. W. Wong, Diagnosis of fibrosis and cirrhosis using liver stiffness measurement in nonalcoholic fatty liver disease, Hepatology, vol.50, issue.Suppl 1, pp.442-450, 2010.
DOI : 10.1002/hep.23312

D. Roulot, S. Czernichow, L. Clésiau, and H. , Liver stiffness values in apparently healthy subjects: Influence of gender and metabolic syndrome, Journal of Hepatology, vol.48, issue.4, pp.606-619, 2008.
DOI : 10.1016/j.jhep.2007.11.020

E. Durango, C. Dietrich, and H. Seitz, Direct comparison of the FibroScan XL and M probes for assessment of liver fibrosis in obese and nonobese patients, Hepat Med, vol.4, pp.43-52, 2013.

S. Petta, E. Vanni, E. Bugianesi, D. Marco, V. Camma et al., The combination of liver stiffness measurement and NAFLD fibrosis score improves the noninvasive diagnostic for severe liver fibrosis in patients with nonalcoholic fatty liver disease. Liver international

Z. M. Younossi, A. B. Koenig, D. Abdelatif, Y. Fazel, L. Henry et al., Global epidemiology of nonalcoholic fatty liver disease-Meta-analytic assessment of prevalence, incidence, and outcomes, Hepatology, vol.24, issue.1
DOI : 10.1210/jc.2014-2739

L. A. Adams, J. F. Lymp, J. St-sauver, S. O. Sanderson, K. D. Lindor et al., The Natural History of Nonalcoholic Fatty Liver Disease: A Population-Based Cohort Study, Gastroenterology, vol.129, issue.1, pp.113-121, 2005.
DOI : 10.1053/j.gastro.2005.04.014

M. Lemoine and L. Serfaty, Foie m??tabolique, EMC - H??patologie, vol.6, issue.4
DOI : 10.1016/S1155-1976(11)54601-7

S. Carette, J. Czernichow, M. Fried, V. Yumuk, and J. Oppert, Chirurgie de l'obésité morbide de l'adulte. EMC - Endocrinologie-Nutrition 2015:1-10 [Article 10-506-H-30].) 41, International Federation for the Surgery of Obesity and Metabolic Disorders--European Chapter