R. Alikhan, F. Peters, R. Wilmott, and A. T. Cohen, Fatal pulmonary embolism in hospitalised patients: a necropsy review, J Clin Pathol, vol.57, issue.12, pp.1254-1261, 2004.

P. Central and P. , , p.1770519

A. T. Cohen, G. Agnelli, F. A. Anderson, J. I. Arcelus, D. Bergqvist et al., Venous thromboembolism (VTE) in Europe. The number of VTE events and associated morbidity and mortality, Thromb Haemost, vol.98, issue.4, p.17938798, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00688301

E. Oger, L. Bressollette, M. Nonent, K. Lacut, B. Guias et al., High prevalence of asymptomatic deep vein thrombosis on admission in a medical unit among elderly patients. The TADEUS Project, Thromb Haemost, vol.88, p.12362229, 2002.
URL : https://hal.archives-ouvertes.fr/hal-00722285

F. Dentali, J. D. Douketis, M. Gianni, W. Lim, and M. A. Crowther, Meta-analysis: anticoagulant prophylaxis to prevent symptomatic venous thromboembolism in hospitalized medical patients, Ann Intern Med, vol.146, issue.4, p.17310052, 2007.

W. H. Geerts, D. Bergqvist, G. F. Pineo, J. A. Heit, C. M. Samama et al., Prevention of venous thromboembolism: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines (8th Edition), Chest, vol.133, issue.6, 2008.

V. F. Tapson, H. Decousus, M. Pini, B. H. Chong, J. B. Froehlich et al., Venous thromboembolism prophylaxis in acutely ill hospitalized medical patients: findings from the International Medical Prevention Registry on Venous Thromboembolism, Chest, vol.132, issue.3, pp.936-981, 2007.
URL : https://hal.archives-ouvertes.fr/ujm-00440050

A. T. Cohen, V. F. Tapson, J. F. Bergmann, S. Z. Goldhaber, A. K. Kakkar et al., Venous thromboembolism risk and prophylaxis in the acute hospital care setting (ENDORSE study): a multinational cross-sectional study, Lancet, vol.371, issue.9610, pp.387-94, 2008.

S. R. Kahn, D. R. Morrison, J. M. Cohen, J. Emed, V. Tagalakis et al., Interventions for implementation of thromboprophylaxis in hospitalized medical and surgical patients at risk for venous thromboembolism. The Cochrane database of systematic reviews, vol.7, 2013.

. Afssaps, Prévention et traitement de la maladie thrombo-embolique veineuse en médecine. Agence Française de sécurité sanitaire des produits de santé: Recommandations de bonne pratique, pp.2014-2021, 2009.

G. H. Guyatt, S. L. Norris, S. Schulman, J. Hirsh, M. H. Eckman et al., Methodology for the development of antithrombotic therapy and prevention of thrombosis guidelines: Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines, Chest, vol.141, issue.2, p.3278053, 2012.

A. Torbicki, A. Perrier, S. Konstantinides, G. Agnelli, N. Galie et al., Guidelines on the diagnosis and management of acute pulmonary embolism: the Task Force for the Diagnosis and Management of Acute Pulmonary Embolism of the European Society of Cardiology (ESC), Eur Heart J, vol.29, issue.18, pp.2276-315, 2008.

S. Schulman and C. Kearon, Subcommittee on Control of Anticoagulation of the S, Standardization Committee of the International Society on T, Haemostasis. Definition of major bleeding in clinical investigations of antihemostatic medicinal products in non-surgical patients, J Thromb Haemost, vol.3, issue.4, 2005.

S. M. Kerry and J. M. Bland, Sample size in cluster randomisation, Bmj, vol.316, issue.7130, 1998.

A. Donner, Some Aspects of the Design and Analysis of Cluster Randomization Trials. Applied Statistics, vol.47, pp.95-113, 1998.

D. M. Murray, S. P. Varnell, and J. L. Blitstein, Design and analysis of group-randomized trials: a review of recent methodological developments, American journal of public health, vol.94, issue.3, p.1448268, 2004.

J. Grimshaw, M. Eccles, R. Thomas, G. Maclennan, C. Ramsay et al., Toward evidence-based quality improvement. Evidence (and its limitations) of the effectiveness of guideline dissemination and implementation strategies 1966-1998, J Gen Intern Med, vol.21, issue.2, p.2557130, 2006.

G. Piazza, E. J. Rosenbaum, W. Pendergast, J. O. Jacobson, R. C. Pendleton et al., Physician alerts to prevent symptomatic venous thromboembolism in hospitalized patients, Circulation, vol.119, issue.16, p.2901546, 2009.

D. A. Garcia, J. Highfill, K. Finnerty, E. Varoz, S. Mcconkey et al., A prospective, controlled trial of a pharmacy-driven alert system to increase thromboprophylaxis rates in medical inpatients, Blood Coagulation & Fibrinolysis, vol.20, issue.7, pp.541-546, 2009.

J. Labarere, J. L. Bosson, M. A. Sevestre, E. Sellier, C. Richaud et al., Intervention targeted at nurses to improve venous thromboprophylaxis, Int J Qual Health Care, vol.19, issue.5, pp.301-309, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00198783

N. Kucher, S. Koo, R. Quiroz, J. M. Cooper, M. D. Paterno et al., Electronic alerts to prevent venous thromboembolism among hospitalized patients, N Engl J Med, vol.352, issue.10, pp.969-77, 2005.

P. R. Dexter, S. Perkins, J. M. Overhage, K. Maharry, R. B. Kohler et al., A computerized reminder system to increase the use of preventive care for hospitalized patients, N Engl J Med, vol.345, issue.13, 2001.

A. Fa, H. B. Wheeler, R. J. Goldberg, D. W. Hosmer, A. Forcier et al., Changing clinical practice. Prospective study of the impact of continuing medical education and quality assurance programs on use of prophylaxis for venous thromboembolism, Arch Intern Med, vol.154, issue.6, 1994.

A. Fontaine, I. Mahé, J. F. Bergmann, J. N. Fiessinger, R. Dhote et al., Effectiveness of written guidelines on the appropriateness of thromboprophylaxis prescriptions for medical patients: a prospective randomized study, Journal of Internal Medicine, vol.260, issue.4, pp.369-76, 2006.

M. R. Nendaz, P. Chopard, C. Lovis, N. Kucher, L. M. Asmis et al., Adequacy of venous thromboprophylaxis in acutely ill medical patients (IMPART): multisite comparison of different clinical decision support systems, Journal of Thrombosis and Haemostasis, vol.8, issue.6, pp.1230-1234, 2010.

R. Khanna, E. Vittinghoff, J. Maselli, and A. Auerbach, Unintended consequences of a standard admission order set on venous thromboembolism prophylaxis and patient outcomes, J Gen Intern Med, vol.27, issue.3, p.3286563, 2012.

G. Maynard, I. H. Jenkins, and G. J. Merli, Venous thromboembolism prevention guidelines for medical inpatients: mind the (implementation) gap, J Hosp Med, vol.8, issue.10, pp.582-590, 2013.

J. M. Overhage, W. M. Tierney, and C. J. Mcdonald, Computer reminders to implement preventive care guidelines for hospitalized patients, Arch Intern Med, vol.156, issue.14, pp.1551-1557, 1996.

S. R. Kahn, W. Lim, A. S. Dunn, M. Cushman, F. Dentali et al., Prevention of VTE in nonsurgical patients: Antithrombotic Therapy and Prevention of Thrombosis, Chest, vol.141, issue.2, p.3278052, 2012.