L. Guidi¹, G. Andrisani¹, D. Frasca², P. Cattani³, M. Marzo¹, C. Felice¹, D. Pugliese¹, A. Papa¹, G.L. Rapaccini¹, B.B. Blomberg², A. Armuzzi¹, ¹Catholic University, IBD Unit, Complesso Integrato Columbus, Rome, Italy, ²Miller School of Medicine, Department of Microbiology and Immunology, Miami, United States, ³Catholic University, Clinical Laboratory Unit, Complesso integrato Columbus, Rome, Italy

A. Jacob¹, M. Fumery², J. Salleron³, L. Michaud¹, C. Spyckerelle⁴, J.-F. Colombel⁵, C. Gower-Rousseau⁶, D. Turck¹, ¹University Hospital, Pediatric Unit, Lille, France, ²Amiens University and Hospital, Gastroenterology, Amiens, France, ³University Hospital EA 2694, Biostatistics, Lille, France, ⁴St Vincent Hospital, Paediatric Unit, Lille, France, ⁵University Hospital, Gastroenterology, Lille, France, ⁶University Hospital, Epidemiology EA 2694, Lille, France

C. Büning*¹, T. Ahmad², B. Bokemeyer³, F. Cummings⁴

¹Krankenhaus Waldfriede, Internal Medicine, Berlin, Germany, ²Royal Devon and Exeter NHS Foundation Trust, Gastroenterology, Exeter, United Kingdom, ³Gastroenterology Practice Minden, Gastroenterology , Minden, Germany, ⁴University Hospital Southampton, Gastroenterology, Southampton, United Kingdom

O. Nomura, T. Shibuya, T. Osada, D. Ishikaw, N. Sakamoto, T. Ogihara, S. Watanabe, Juntendo University, Gastroenterology, Tokyo, Japan

G. Bouguen¹, D. Laharie², S. Nancey³, X. Hébuterne⁴, B. Flourié³, J. Filippi⁴, X. Roblin⁵, C. Trang⁶, A. Boureille⁶, A. Babouri⁷, J.-F. Bretagne¹, L. Siproudhis¹, L. Peyrin-Biroulet⁷, ¹CHU Pontchaillou, Service des Maladies de l'Appareil Digestif, Rennes, France, ²University Hospital of Bordeaux, Hôpital Haut-Lévêque, Gastroenterology, Bordeaux, France, ³University Hospital of Lyon, Gastroenterology, Lyon, France, ⁴University Hospital of Nice, Gastroenterology, Nice, France, ⁵University Hospital of Saint-Etienne, Gastroenterology, Saint-Etienne, France, ⁶University Hospital of Nancy, Gastroenterology, Nantes, France, ⁷University Hospital of Nancy, Gastroenterology, Nancy, France

D. Abdulganieva*¹, E. Bodryagina¹, A. Odintsova²

¹Kazan State Medical University, Department of Hospital Therapy, Kazan, Russian Federation, ²Republican Clinical Hospital, Department of Gastroenterology, Kazan, Russian Federation

S. O'Connor^1,2, M. Lalji¹, G. Holtmann^1,2, P. Pillans^2,3, N. Martin¹, D. Burger¹, ¹Princess Alexandra Hospital, Gastroenterology, Brisbane, Australia, ²University of Queensland, Gastroenterology, Brisbane, Australia, ³Princess Alexandra Hospital, Clincal Pharmacology, Brisbane, Australia

P. Alvisi¹, A. Barabino², S. Cucchiara³, E. Miele⁴, C. Romano⁵, A. Ravelli⁶, D. Knafelz⁷, P. Lionetti⁸, G. Guariso⁹, M. Aloi³, S. Arrigo², L. Balzani¹⁰, S. Martellossi¹¹, ¹Maggiore hospital, Pediatric unit, Bologna, Italy, ²Gaslini hospital, Gastroenterology and Endoscopy unit, Genua, Italy, ³Sapienza University of Rome, Pediatric Gastroenterology and Liver unit, Rome, Italy, ⁴University of Naples Federico II, Pediatric unit, Naples, Italy, ⁵University of Messina, Pediatric Gastroenterology and Liver unit, Messina, Italy, ⁶Children's hospital, Gastroenterology and GI Endoscopy unit, Brescia, Italy, ⁷Bambino Gesù Hospital, Hepatology and Gastroenterology unit, Rome, Italy, ⁸Meyer Pediatric Hospital, Gastroenterology and Nutrition unit, Florence, Italy, ⁹University of Padua, Pediatric Gastroenterology unit, Padua, Italy, ¹⁰Bologna Hospitals, Directional Staff, Bologna, Italy, ¹¹Institute of Child Health, IRCSS Burlo Garofolo, Department Of Pediatrics, Trieste, Italy

T. Kawaguchi*, R. Tanaka, M. Sako, N. Yoshimura, M. Takazoe

Tokyo Yamate Medical Center, Department of IBD, Tokyo, Japan

M. Dadalski, A. Wegner, J. Kierkus, Children's Memorial Health Institute, Gastroenterology, Hepatology and Feeding Disorders, Warsaw, Poland

S. Gokturk¹, O. Mutluay Soyer¹, A. Ciftcibasi Ormeci¹, B. Baran¹, S. Evirgen¹, F. Akyüz¹, Ç. Karaca¹, K. Demir¹, F. Besisik¹, S. Kaymakoglu¹, ¹Istanbul School of Medicine, Gastroenterohepatology, Istanbul, Turkey

L. Laterza*¹, S. Bibbò², A.C. Piscaglia³, V. Arena⁴, M. Brisigotti⁵, G. Fabbretti⁵, A. Amato⁶, M.L. Stefanelli³, E. Gaetani¹, V. Cesario^{1, 3}, G. Cammarota¹, A. Gasbarrini¹, F. Scaldaferri¹

¹Catholic University of Rome, Inernal Medicine and Gastroenterology, Rome, Italy, ²Catholic University of Rome, Internal Medicine and Gastroenterology, Rome, Italy, ³State Hospital, Gastroenterology and Endoscopy Unit, Borgo Maggiore, San Marino, ⁴Catholic University, Institute of Pathology, Rome, Italy, ⁵"Infermi" Hospital, Instiute of Pathology, Rimini, Italy, ⁶Catholic University of Rome, Institute of Anesthesiology and Resuscitation, Rome, Italy

J. Santos-Antunes¹, F. Magro¹, F. Vilas-Boas¹, E. Rodrigues-Pinto¹, R. Coelho¹, O. Ribeiro², S. Lopes¹, G. Macedo¹, ¹Centro Hospitalar São João, Gastroenterology, Porto, Portugal, ²Centro Hospitalar S. João, Centre for Research in Health Informatics Systems and Technologies (CINTESIS), Porto, Portugal

J. Kierkus¹, B. Iwanczyk², A. Wegner¹, M. Dadalski¹, U. Grzybowska-Chlebowczyk³, I. Lazowska⁴, J. Maslana⁵, E. Toporowska-Kowalska⁶, G. Czaja-Bulsa⁷, G. Mierzwa⁸, B. Korczowski⁹, E. Czkwianianc¹⁰, A. Zabka¹¹, E. Szymanska¹, E. Krzesiek², S. Wiecek¹², M. Sladek¹³, ¹The Childrens Memorial Health Institute, Gastroenterology, Hepatology and Immunology, Warsaw, Poland, ²Medical University of Wroclaw, Department of Pediatrics, Gastroenterology and Nutrition, Wroclaw, Poland, ³Medical University of Silesia, Gastroenterology Unit, Upper-Silesian Child Health Care Centre in Katowice, Department of Paediatrics, Katowice, Poland, ⁴Medical University of Warsaw, Department of Pediatric Gastroneterology and Nutrition, Warsaw, Poland, ⁵Wl. Buszkowski Kielce Province Children's Hospital, Kielce, Poland, Kielce, Poland, ⁶Medical University of Lodz Poland, Department of Paediatric Allergology, Gastroenterology and Nutrition, Lodz, Poland, ⁷Pomeranian Medical University, Division of Paediatrics, Gastroenterology and Rheumatology of Zdroje Hospital in Szczecin, Paediatric Nursery Unit, Szczecin, Poland, ⁸Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, Poland, Chair and Department of Pediatrics, Allergology and Gastroenetrology, Bydgoszcz, Poland, ⁹State Hospital. Medical College. University of Rzeszów. Poland, Department of Pediatrics, Rzeszow, Poland, ¹⁰Polish Mother's Memorial Hospital. Research Institute Lodz, Gastroenterology and Pediatric Depts, Lodz, Poland, ¹¹Medical University of Silesia, Zabrze, Department of Pediatrics, Zabrze, Poland, ¹²Medical University of Silesia, Gastroenterology Unit, Upper-Silesian Child Health Care Centre in Katowice, The Department of Paediatrics, Katowice, Poland, ¹³Jagiellonian University School of Medicine, Krakow, Department of Pediatrics, Gastroenterology and Nutrition, Krakow, Poland

M. Van der Valk*¹, M.-J. Mangen², M. van der Have¹, M. Severs³, G. Dijkstra⁴, A. van Bodegraven⁵, H. Fidder³, D. de Jong⁶, M. Pierik⁷, J. van der Woude⁸, M. Romberg-Camps⁹, C. Clemens¹⁰, J. Jansen¹¹, P. van de Meeberg¹², N. Mahmmod¹³, A. van der Meulen- de Jong¹⁴, C. Ponsioen¹⁵, C. Bolwerk¹⁶, R. Vermeijden¹⁷, P. Siersema³, M. Leenders³, B. Oldenburg³

¹University Medical Center Utrecht, Gastroenterology and hepatology, Utrecht, Netherlands, ²University Medical Centre Utrecht, Julius Center for Health Sciences and Primary Care, Utrecht, Netherlands, ³University Medical Centre Utrecht, Gastroenterology and hepatology, Utrecht, Netherlands, ⁴University Medical Centre Groningen, Gastroenterology and hepatology, Groningen, Netherlands, ⁵VU University Medical Centre, Gastroenterology and hepatology, Amsterdam, Netherlands, ⁶Radboud University Medical Centre, Gastroenterology and hepatology, Nijmegen, Netherlands, ⁷Maastricht University Medical Centre, Gastroenterology and hepatology, Maastricht, Netherlands, ⁸Erasmus University Medical Centre, Gastroenterology and hepatology, Rotterdam, Netherlands, ⁹Orbis Medical Centre, Gastroenterology and hepatology, Sittard, Netherlands, ¹⁰Diaconessenhuis, Gastroenterology and hepatology, Leiden, Netherlands, ¹¹Onze Lieve Vrouwe Gasthuis, Gastroenterology and hepatology, Amsterdam, Netherlands, ¹²Slingeland Hospital, Gastroenterology and hepatology, Doetinchem, Netherlands, ¹³Antonius Hospital, Gastroenterology and hepatology, Nieuwegein, Netherlands, ¹⁴Leiden Univesity Medical Centre, Gastroenterology and hepatology, Leiden, Netherlands, ¹⁵Academic Medical Centre Amsterdam, Gastroenterology and hepatology, Amsterdam, Netherlands, ¹⁶Reinier de Graaf Group, Gastroenterology and hepatology, Delft, Netherlands, ¹⁷Meander Medical Centre, Gastroenterology and hepatology, Amersfoort, Netherlands

C. Primas, W. Eigner, A. Eser, C. Gratzer, S. Reinisch, H. Vogelsang, G. Novacek, W. Reinisch, L. Kazemi-Shirazi, Medical University of Vienna, Dept. for Gastroenterology and Hepatology, Vienna, Austria

K.-M. Lee¹, Y.T. Jeen², J.Y. Cho³, C.K. Lee⁴, D.I. Park³, J.-P. Im⁵, S.-A. Jung⁶, H. Choi⁷, S.J. Park⁸, Y.S. Kim⁹, ¹The Catholic University of Korea, Suwon, South Korea, ²Korea University, South Korea, ³Sungkyunkwan University, South Korea, ⁴Kyung Hee University, South Korea, ⁵Seoul National University, South Korea, ⁶Ewha Womans University, South Korea, ⁷The Catholic University of Korea, South Korea, ⁸Yonsei University, South Korea, ⁹Inje University, South Korea

A. Echarri^*1, R. Ferreiro², R. Fraga¹, J. Cid³, M. Barreiro², D. Carpio⁴, S. Pereira⁵, L. De Castro⁵, S. Soto⁶, A. Fernandez-Villaverde⁷, B. Gonzalez⁸, E. Santos⁹

¹Complejo Hospitalario Ferrol, Gastroenterology, Ferrol, Spain, ²Complejo Hospitalario Universitario Santiago, Gastroenterology, Santiago, Spain, ³Complejo Hospitalario Coruña, Immunology, Coruña, Spain, ⁴Complejo Hospitalario Pontevedra, Gastroenterology, Pontevedra, Spain, ⁵Complejo Hospitalario Vigo, Gastroenterology, Vigo, Spain, ⁶Complejo Hospitalario Orense, Gastroenterology, Orense, Spain, ⁷Povisa, Gastroenterology, Vigo, Spain, ⁸Complejo Hospitalario Coruña, Gastroenterology, Coruña, Spain, ⁹Complejo Hospitalario Lugo, Gastroenterology, Lugo, Spain

E.S. Kim¹, K.B. Cho¹, K.S. Park¹, B.I. Jang², K.O. Kim², E.Y. Kim³, S.W. Jeon⁴, M.K. Jung⁴, C.H. Yang⁵, ¹Keimyung University School of Medicine, Internal Medicine, Daegu, Korea, Republic of, ²Yeungnam University College of Medicine, Internal Medicine, Daegu, Korea, Republic of, ³Catholic University of Daegu School of Medicine, Internal Medicine, Daegu, Korea, Republic of, ⁴Kyungpook National University School of Medicine, Internal Medicine, Daegu, Korea, Republic of, ⁵Dongguk University College of Medicine, Division of gastroenterology and Hepatology, department of Internal Medicine, Kyungju, Korea, Republic of

M. Sanges¹, O. Donatore¹, D. Trio¹, M. Miniero¹, A. Piacente¹, M.G. Ceriello¹, L. Florio¹, D. Mattera¹, R. Sollazzo¹, A. D'Arienzo¹, ¹Federico II University of Naples, Gastroenterology Unit, Department of Clinical and Experimental Medicine, Naples, Italy