S.J. Martínez-Domínguez¹, E. Alfaro¹, P. Carrera¹, Á. Lanas¹, Á. Pérez-Aísa², D. Vaira³, G. Fiorini³, I.M. Saracino³, L. Jonaitis⁴, B. Tepes⁵, D. Bordin⁶, A. Keco-Huerga⁷, M. Castro-Fernández⁷, A. Lucendo⁸, L. Vologzhanina⁹, L. Bujanda¹⁰, N. Brglez Jureric¹¹, M. Denkovski¹¹, M. Leja¹², R. Bumane¹², E. Mammadov¹³, G. Babayeva¹³, U. Mahmudov¹⁴, M. Caldas¹⁵, L. Rodrigo¹⁶, F. Lerang¹⁷, G. Fadieienko¹⁸, R. Abdulkhakov¹⁹, J.M. Huguet Malavés²⁰, O. Zaytsev²¹, T. Ilchishina²², L. Fernández- Salazar²³, N. Alcaide²³, B. Velayos²³, A. Silkanovna Sarsenbaeva²⁴, I. Bakulin²⁵, A.G. Gravina²⁶, M. Romano²⁶, M. Perona²⁷, S. Alekseenko²⁸, J. Barrio²⁹, M. Areia³⁰, Ó. Núñez³¹, P. Bogomolov³², B.J. Gómez Rodríguez³³, M. Domínguez-Cajal³⁴, J. Gómez Camarero³⁵, M. Jiménez Moreno³⁵, S. Georgopoulos³⁶, P. Almela Notari³⁷, A. Tonkic³⁸, R. Pellicano³⁹, H. Simsek⁴⁰, L. Kunovský⁴¹, A. Gasbarrini⁴², J.M. Botargues Bote⁴³, G.M. Buzas⁴⁴, M. Fernández-Bermejo⁴⁵, P. Phull⁴⁶, M. Venerito⁴⁷, P. Malfertheiner⁴⁷, R. Rosania⁴⁷, A. Link⁴⁷, E. Iyo⁴⁸, J. Kupinskas⁴, O. Shvets⁴⁹, R. Marcos Pinto⁵⁰, T. Rokkas⁵¹, I. Simsek⁵², S. Smith⁵³, D. Boltin⁵⁴, D. Lamarque⁵⁵, D. Dobru⁵⁶, W. Marlicz⁵⁷, V. Milivojevic⁵⁸, L. Boyanova⁵⁹, V. Lamy⁶⁰, M. Doulberis⁶¹, P. Bytzer⁶², L. Capelle⁶³, O. Gridnyev⁶⁴, A. Ristimaki⁶⁵, A. Cano⁶⁶, I. Puig⁶⁶, O.P. Nyssen¹⁵, F. Mégraud⁶⁷, C. O'Morain⁵³ y J.P. Gisbert, en nombre de los investigadores Hp-EuReg<sup>15

1</sup>Hospital Clínico Universitario Lozano Blesa, IIS Aragón, Zaragoza. ²Agencia Sanitaria Costa del Sol, Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC), Marbella. ³Department of Surgical and Medical Sciences, University of Bologna, Bologna, Italia. ⁴Lithuanian University of Health Sciences, Kaunas, Lituania. ⁵AM DC Rogaska, Rogaska Slatina, Eslovenia. ⁶AS Loginov Moscow Clinial Scientific Center, Moscow, Rusia. ⁷Hospital de Valme, Sevilla. ⁸Hospital General de Tomelloso. ⁹Gastrocentr, Perm, Rusia. ¹⁰Hospital Donostia/Instituto Biodonostia, Centro de investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Universidad del País Vasco (UPV/EHU), San Sebastián. ¹¹Interni oddelek, Diagnostic Centre, Bled, Eslovenia. ¹²Digestive Diseases Centre GASTRO, Institute of Clinical and Preventive Medicine & Faculty of Medicine, University of Latvia, Riga, Letonia. ¹³Department of Therapy, Azerbaijan State Advanced Training Institute for Doctors named after A.ALIYEV, Baku, Azerbaiyán. ¹⁴Modern Hospital, Baku, Azerbaiyán. ¹⁵Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa (IIS-IP), Universidad Autónoma de Madrid (UAM) y Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid. ¹⁶Hospital de Asturias, Oviedo. ¹⁷17Østfold Hospital Trust, Grålum, Noruega. ¹⁸18Digestive Ukrainian Academy of Medical Sciences, Kyiv, Ucrania. ¹⁹Kazan State Medical University, Rusia. ²⁰Hospital General Universitario de Valencia. ²¹First Clinical Medical Centre, Kovrov, Rusia. ²²SM-clinic, Saint-Petersburg, Rusia. ²³Hospital Clínico Universitario de Valladolid. ²⁴Chelyabinsk Regional Clinical Hospital, Rusia. ²⁵North-western State Medical University St Petersburg, Rusia. ²⁶Università degli Studi della Campania "Luigi Vanvitelli", Napoli, Italia. ²⁷Hospital Quirón, Marbella. ²⁸Far Eastern State Medical University, Rusia. ²⁹Hospital Río Hortega, Valladolid. ³⁰Portuguese Oncology Institute Coimbra, Portugal. ³¹Hospital Universitario La Moraleja, Madrid. ³²Universal clinic-Private medical center, Moscow, Rusia. ³³Hospital Virgen Macarena, Sevilla. ³⁴Hospital San Jorge, Huesca. ³⁵Hospital Universitario de Burgos. ³⁶Athens Medical, P. Faliron General Hospital, Athens, Grecia. ³⁷Hospital General Universitario de Castellón. ³⁸University Hospital of Split, School of Medicine, University of Split, Croacia. ³⁹Outpatient clinic, Molinette-SGAS Hospital, University of Turin, Italia. ⁴⁰Internal Medicine, Hacettepe, University School of Medicine, Ankara, Turquía. ⁴¹Department of Gastroenterology and Internal Medicine and Department of Surgery, University Hospital Brno, Faculty of Medicine, Masaryk University, Brno, República Checa. ⁴²Medicina Interna, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Roma, Italia. ⁴³Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat. ⁴⁴Ferencváros Health Centre, Budapest, Hungría. ⁴⁵Clínica San Francisco, Cáceres. ⁴⁶Aberdeen Royal Infirmary, Reino Unido. ⁴⁷Otto-von-Guericke University, Magdeburg, Alemania. ⁴⁸Hospital Comarcal de Inca, Mallorca. ⁴⁹Internal Medicine, National Medical University named after O.O.Bogomolets, Kyiv, Ucrania. ⁵⁰Centro Hospitalar do Porto Institute of Biomedical Sciences Abel Salazar, University of Porto, CINTESIS, University of Porto, Portugal. ⁵¹Henry Dunant Hospital, Athens, Grecia. ⁵²Dokuz Eylul University School of Medicine, Izmir, Turquía. ⁵³Trinity College Dublin, Dublin, Irlanda. ⁵⁴Rabin Medical Center, Beilinson Campus, Petah Tikva, Israel. ⁵⁵Hôpital Ambroise Paré,Université de Versailles St-Quentin en Yvelines, Boulogne Billancourt, Francia. ⁵⁶Targu Mures Emergency Hospital, Târgu Mure¿, Rumanía. ⁵⁷Pomeranian Medical University, Szczecin, Polonia. ⁵⁸Clinical Center of Serbia and School of Medicine, University of Belgrade, Belgrade, Serbia. ⁵⁹Medical Microbiology, Medical University of Sofia, Sofia, Bulgaria. ⁶⁰CHU de Charleroi, Charleroi, Bélgica. ⁶¹KSA Kantonsspital Aarau, Aarau, Suiza. ⁶²Clinical Medicine, Zealand University Hospital, Copenhagen University, Copenhagen, Dinamarca. ⁶³Meander Medical Center, Amersfoort, Países Bajos. ⁶⁴Government Institution 'L.T.Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine', Kharkiv, Ucrania. ⁶⁵Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital; Medicum and Applied Tumor Genomics, Research Programs Unit, Faculty of Medicine, University of Helsinki, Helsinki, Finlandia. ⁶⁶Althaia Xarxa Assistencial Universitària de Manresa y Universitat de Vic-Universitat Central de Catalunya (UVicUCC), Manresa. ⁶⁷INSERM 1053, Université de Bordeaux, Bordeaux, Francia.