| Medical University of Vienna,Center for Rare Diabetes and Congenital Hyperinsulinism / Dpt. of Pediatrics1. | Austria | Vienna | Birgit Rami-Merhar |
| Cliniques universitaires Saint-Luc | Belgium | Brussel | Philippe Lysy |
| UZ Brussels | Belgium | Brussel | Willem Staels |
| UZ Leuven | Belgium | Leuven | Kristina Casteels, Ann Mertens, Chantal Mathieu |
| UMHAT “Sveta Marina” (Varna) | Bulgaria | Varna | Violeta Iotova, Sonya Galcheva, Mila Boyadzhieva |
| Vuk Vrhovac University Clinic for Diabetes, Endocrinology and Metabolic Diseases, Merkur University Hospital1. | Croatia | Zagreb | Dario Rahelic |
| University Hospital Motol | Czechia | Prague | Zdenek Sumnik, Stepanka Pruhova |
| Aarhus University Hospital | Denmark | Aarhus | Julie Støy, Kurt Kristensen |
| Odense Universitetshospital | Denmark | Odense | Henrik Christesen, Marianne Skovsager Andersen |
| Tartu University Hospital | Estonia | Tartu | Vallo Tillmann, Vallo Volke |
| HUS Helsinki University Hospital, Hospital District of Helsinki and Uusimaa (EndoERN_FIN) | Finland | Helsinki | Päivi Miettinen, Tiinamaija Tuomi |
| Assistance Publique – Consortium Cochin, Robert Debré, Necker, St Antoine, La Pitié Salpétrière, Trousseau University Hospitals | France | Paris | Corinne Vigouroux, Michel Polak |
| Charité Universitätsmedizin Berlin | Germany | Berlin | Oliver Blankenstein, Peter Kühnen, Angela Galler, Thomas Bobbert |
| Universitaetsklinikum Duesseldorf, AöR, Klinik für Allgemeine Pädiatrie, Neonatologie und Kinderkardiologie | Germany | Düsseldorf | Thomas Meissner, Sebastian Kummer, Alena Welters |
| Hannoversche Kinderheilanstalt, Diabetes Centre for Children and Adolescents | Germany | Hannover | Katharina Klee, Felix Reschke |
| Otto-von-Guericke University, Med. Faculty – Central German Network for Rare diseases | Germany | Magdeburg | Klaus Mohnike, Martin Zenker, Susann Empting |
| Universitätsklinikum Ulm (Ulm University Medical Center) | Germany | Ulm | Martin Wabitsch, Julia von Schnurbein |
| Aghia Sophia Children’s Hospital | Greece | Athens | Christina Kanaka-Gantenbein, Ioannis-Anargyros Vasilakis, Maria Mpinou |
| Beaumont Hospital & Children’s Health Ireland | Ireland | Dublin | Susan O'Connell |
| IRCCS Azienda Ospedaliero-Universitaria di Bologna | Italy | Bologna | Guido Di Dalmazi, Alessandra Gambineri, Giulio Maltoni, Federico Baronio |
| Meyer Children’s Hospital Florence | Italy | Florence | Sonia Toni, Barbara Piccini |
| IRCCS Istituto Giannina Gaslini, Genova | Italy | Genova | Mohamad Maghnie, Giuseppe D'Annunzio |
| Ospedale San Raffaele | Italy | Milan | Riccardo Bonfanti, Marco Manzoni |
| AOU Università degli Studi della Campania “Luigi Vanvitelli”, Napoli | Italy | Naples | Dario Iafusco, Angela Zanfardino, Maria Ida Maiorino |
| Azienda Ospedaliera Universitaria “Federico II”, Napoli | Italy | Naples | Annamaria Colao, Mariacarolina Salerno, Adriana Franzese, Enza Mozzillo |
| Azienda Ospedaliera di Padova (AOP) | Italy | Padova | Laura Guazzarotti, Roberto Vettor, Pietro Maffei |
| Obesity and Lipodystrophy Centre, Endocrinology Unit, Azienda Ospedaliero Universitaria Pisana | Italy | Pisa | Ferruccio Santini, Giovanni Ceccarini |
| Azienda Ospedaliero-Universitaria Policlinico Umberto I | Italy | Roma | Andrea Isidori |
| Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino | Italy | Turin | Luisa Desanctis, Davide Tinti, Fabio Broglio |
| AOUI di Verona | Italy | Verona | Franco Antoniazzi, Paolo Cavarzere |
| Childrens Clinical University Hospital1. | Latvia | Rīga | |
| Hospital of Lithuanian University of Health Sciences Kauno Klinikos | Lithuania | Kaunas | Evalda Danyte, Ingrida Stankute |
| Centre Hospitalier de Luxembourg | Luxembourg | Luxemburg | Marianne Becker, Ulrike Schierloh |
| Leiden University Medical Center | Netherlands | Leiden | Eelco de Koning, Marielle Schroijen |
| Public Pediatric Teaching Hospital | Poland | Warsaw | Agnieszka Szypowska, Lidia Groele, Katarzyna Dżygało |
| APDP – Diabetes Portugal | Portugal | Lisbon | João Raposo, Ana Carolina Neves |
| University Hospital Martin, Dept of Paediatrics of Jessenius Medical Faculty Comenius University1. | Slovakia | Martin | Jarmila Vojtková |
| University Medical Centre Ljubljana | Slovenia | Ljubljana | Darja Smigoc, Primoz Kotnik, Jasna Šuput Omladič |
| Hospital Sant Joan de Déu Barcelona | Spain | Barcelona | Roque Cardona-Hernandez |
| Hospital Universitario Cruces | Spain | Bilbao | Sonia Gaztambide, Luis Castano, Itxaso Rica |
| Sahlgrenska University Hospital | Sweden | Gothenburg | Gudmundur Johannsson, Jovanna Dahlgren |
