| Cliniques universitaires Saint-Luc | Belgium | Brussel | Dominique Maiter |
| Hôpital Universitaire de Bruxelles (HUDERF-Erasme) | Belgium | Brussel | Aglaia Kyrilli |
| UZ Brussels | Belgium | Brussel | Inge Gies |
| UZ Antwerpen | Belgium | Edegem | Christophe De Block |
| Ghent University Hospital | Belgium | Ghent | Martine Cools |
| UZ Leuven | Belgium | Leuven | Kristina Casteels |
| Centre Hospitalier Universitaire de Liège | Belgium | Liege | Albert Beckers |
| USHATE “ACAD IVAN Penchev” | Bulgaria | Sofia | Sabina Zaharieva |
| UMHAT “Sveta Marina” (Varna) | Bulgaria | Varna | Violeta Iotova |
| Královské Vinohrady University Hospital in Prague | Czech Republic | Prague | Ludmila Brunerova |
| University Hospital Motol | Czech Republic | Prague | Zdenek Sumnik |
| Všeobecná fakultní nemocnice v Praze | Czech Republic | Prague | Michal Krsek |
| Aarhus University Hospital | Denmark | Aarhus | Claus H. Gravholt |
| Copenhagen University Hospital, Rigshospitalet | Denmark | Copenhagen | Anders Juul |
| Odense Universitetshospital | Denmark | Odense | Henrik Christesen |
| Tartu University Hospital | Estonia | Tartu | Vallo Tillmann |
| HUS Helsinki University Hospital, Hospital District of Helsinki and Uusimaa (EndoERN_FIN) | Finland | Helsinki | Camilla Schalin-Jäntti |
| Assistance Publique – Hôpitaux de Marseille | France | Marseille | Thierry Brue |
| CHU Angers | France | Angers | Patrice Rodien |
| Hospices Civils de Lyon | France | Lyon | Gérald Raverot |
| Assistance Publique – Consortium Cochin, Robert Debré, Necker, St Antoine, La Pitié Salpétrière, Trousseau University Hospitals | France | Paris | Jérôme Bertherat |
| Assistance Publique – Consortium Pitie Salpêtrière – French Reference Centre for Prader-Willi Syndrome | France | Paris | Christine Poitou |
| Hôpital Bicêtre | France | Paris | Philippe Chanson |
| Reference centre for rare diseases of calcium and phosphate-HEGP | France | Paris | Pascal Houillier |
| CHU Toulouse | France | Toulouse | Maithe Tauber |
| University Hospital Aachen | Germany | Aachen | Thomas Eggermann |
| Charité Universitätsmedizin Berlin | Germany | Berlin | Peter Kühnen |
| Katholisches Klinikum Bochum | Germany | Bochum | Corinna Grasemann |
| Universitaetsklinikum Duesseldorf, AöR, Klinik für Allgemeine Pädiatrie, Neonatologie und Kinderkardiologie | Germany | Düsseldorf | Thomas Meissner |
| University Hospital Essen – Center for Rare Endocrine Diseases | Germany | Essen | Dagmar Fuehrer |
| Hannoversche Kinderheilanstalt, Diabetes Centre for Children and Adolescents | Germany | Hannover | Thomas Danne |
| Universitätsklinikum Schleswig-Holstein | Germany | Lubeck | Olaf Hiort |
| Otto-von-Guericke University, Med. Faculty – Central German Network for Rare diseases | Germany | Magdeburg | Klaus Mohnike |
| University Medical Center Mainz | Germany | Mainz | Dirk Prawitt |
| University Hospital Marburg | Germany | Marburg | Markus Luster |
| Ludwig-Maximilian-University Munich | Germany | Munchen | Nicole Reisch |
| Universitätsklinikum Münster | Germany | Munster | Julia Rohayem |
| Universitätsklinikum Tübingen | Germany | Tübingen | Gerhard Binder |
| Universitätsklinikum Ulm (Ulm University Medical Center) | Germany | Ulm | Martin Wabitsch |
| University Hospital Würzburg | Germany | Wuerzburg | Martin Fassnacht |
| Aghia Sophia Children’s Hospital | Greece | Athens | Christina Kanaka-Gantenbein |
| Evangelismos General Hospital | Greece | Athens | Dimitra-Argyro Vassiliadi |
| General Hospital of Athens “LAIKO” | Greece | Athens | Eva Kassi |
| Semmelweis University | Hungary | Budapest | Miklos Toth |
| Beaumont Hospital | Ireland | Dublin | Mark Sherlock |
| Azienda Ospedaliera Sant’Orsola Malpighi | Italy | Bologna | Alessandra Cassio |
| Azienda Ospedaliero Universitaria di Ferrara | Italy | Ferrara | Maria Chiara Zatelli |
| Meyer Children’s Hospital Florence | Italy | Florence | Sonia Toni |
| University Hospital Florence | Italy | Florence | Csilla Krausz |
| IRCCS Istituto Giannina Gaslini, Genova | Italy | Genova | Mohamad Maghnie |
| IRCCS Ospedale Policlinico San Martino – Genova – Italy | Italy | Genova | Diego Ferone |
| AOU policlinico “G.Martino” Messina | Italy | Messina | Salvatore Cannavò |
| Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milano | Italy | Milan | Giovanna Mantovani |
| Istituto Auxologico Italiano – Istituto di Ricovero e Cura a Carattere Scientifico | Italy | Milan | Luca Persani |
| Ospedale San Raffaele | Italy | Milan | Gianni Russo |
| AOU di Modena | Italy | Modena | Vincenzo Rochira |
| Antonio Cardarelli Hospital- Azienda Ospedaliera di rilievo nazionale | Italy | Naples | Francesco Scavuzzo |
| AOU Università degli Studi della Campania “Luigi Vanvitelli”, Napoli | Italy | Naples | Katherine Esposito |
| Azienda Ospedaliera Universitaria “Federico II”, Napoli | Italy | Naples | Annamaria Colao |
| Azienda Ospedaliera di Padova (AOP) | Italy | Padova | Carla Scaroni |
| Azienda Ospedaliera Universitaria Pisana – Obesity Centre, Endocrinology Unit | Italy | Pisa | Ferruccio Santini |
| Azienda Unità Sanitaria Locale-IRCCS of Reggio Emilia | Italy | Reggio Emilia | Chiara Grasselli |
| Azienda Ospedaliero-Universitaria Policlinico Umberto I | Italy | Roma | Andrea Lenzi |
| Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino | Italy | Turin | Ezio Ghigo |
| AOUI di Verona | Italy | Verona | Franco Antoniazzi |
| Hospital of Lithuanian University of Health Sciences Kauno Klinikos | Lithuania | Kaunas | Rasa Verkausiene |
| Centre Hospitalier de Luxembourg | Luxembourg | Luxemburg | Marianne Becker |
| Amsterdam UMC, location AMC | Netherlands | Amsterdam | Paul van Trotsenburg |
| Amsterdam UMC, location VUMC | Netherlands | Amsterdam | Martin den Heijer |
| University Medical Center Groningen | Netherlands | Groningen | Thera Links |
| Leiden University Medical Center | Netherlands | Leiden | Nienke Biermasz |
| Maastricht University Medical Center – Center for Thyroid Carcinoma | Netherlands | Maastricht | Bas Havekes |
| Radboud University Nijmegen Medical Center – including Amalia’s children Hospital | Netherlands | Nijmegen | Hedi Claahsen |
| Erasmus MC: University Medical Center Rotterdam | Netherlands | Rotterdam | Erica van den Akker |
| University Medical Center Utrecht – Dept of Endocrine Oncology | Netherlands | Utrecht | Gerlof Valk |
| Máxima Medisch Centrum | Netherlands | Veldhoven | Harm Haak |
| Maria Sklodowska-Curie National Research Institute of Oncology (MSCNRIO) | Poland | Gliwice | Jolanta Krajewska |
| Saint John Paul II Upper Silesian Child Health Centre, Public Clinical Hospital no.6 of the Medical University of Silesia in Katowice | Poland | Katowice | Aneta Gawlik |
| Karol Jonscher’s Clinical Hospital of Poznan University of Medical Sciences | Poland | Poznan | Marek Niedziela |
| Public Pediatric Teaching Hospital | Poland | Warsaw | Agnieszka Szypowska |
| APDP – Diabetes Portugal | Portugal | Lisbon | João Raposo |
| Centro Hospitalar de Lisboa Norte, EPE | Portugal | Lisbon | Maria João Bugalho |
| Centro Hospitalar Universitario de São João, EPE | Portugal | Porto | Elisabete Rodrigues |
| Spitalul Clinic de Psihiatrie “Prof. dr. Alexandru Obregia” | Romania | Bucharest | Dana Craiu |
| Institute of Oncology “Prof dr. Ion Chiricuta” CLUJ NAPOCA | Romania | Cluj-Napoca | Doina Piciu |
| Spitalul Clinic de Urgenta pentru Copii, Cluj-Napoca | Romania | Cluj-Napoca | Simona Bucerzan |
| Spitalul Clinic Judetean de Urgenta Cluj (Cluj County Emergency Clinical Hospital) | Romania | Cluj-Napoca | Carmen Emanuela Georgescu |
| University Medical Centre Ljubljana | Slovenia | Ljubljana | Tadej Battelino |
| Fundacio de Gestio Sanitaria Hospital de la Santa Creu i Sant Pau | Spain | Barcelona | Anna Aulinas |
| Hospital Sant Joan de Déu Barcelona | Spain | Barcelona | Roque Cardona-Hernandez |
| Hospital Universitari Vall d’Hebron | Spain | Barcelona | Maria Clemente |
| Hospital Universitario Cruces | Spain | Bilbao | Sonia Gaztambide |
| Complejo Hospitalario Regional Virgen del Rocío | Spain | Sevilla | Alfonso Soto Moreno |
| Sahlgrenska University Hospital | Sweden | Gothenburg | Gudmundur Johannsson |
| Karolinska University Hospital | Sweden | Stockholm | Anna Nordenström |