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1 Centre d'Epidémiologie Clinique, Hôtel Dieu Hospital, Assistance Publique Hôpitaux de Paris, Paris, France; Gastroenterology and Nutrition, Saint-Antoine Hospital, Assistance Publique Hôpitaux de Paris, Paris 75012, France. Electronic address: jdzeitoun@yahoo.fr.
2 Centre d'Epidémiologie Clinique, Hôtel Dieu Hospital, Assistance Publique Hôpitaux de Paris, Paris, France; Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA.
1 Centre d'Epidémiologie Clinique, Hôtel Dieu Hospital, Assistance Publique Hôpitaux de Paris, Paris, France; Gastroenterology and Nutrition, Saint-Antoine Hospital, Assistance Publique Hôpitaux de Paris, Paris 75012, France. Electronic address: jdzeitoun@yahoo.fr.
2 Centre d'Epidémiologie Clinique, Hôtel Dieu Hospital, Assistance Publique Hôpitaux de Paris, Paris, France; Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA.