| Cliniques universitaires de Bruxelles – Hôpital Erasme | Belgium | Brussel | Claudine Heinrichs |
| Cliniques universitaires Saint-Luc | Belgium | Brussel | Dominique Maiter |
| UZ Brussels | Belgium | Brussel | Inge Gies |
| 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 | Jan Lebl |
| Aarhus University Hospital | Denmark | Aarhus | Claus H. Gravholt |
| Copenhagen University Hospital, Rigshospitalet | Denmark | Copenhagen | Anders Juul |
| Tartu University Hospital | Estonia | Tartu | Vallo Tillmann |
| Assistance Publique – Hôpitaux de Marseille | France | Marseille | Thierry Brue |
| CHU Angers | France | Angers | Patrice Rodien |
| Assistance Publique – Consortium Cochin, Robert Debré, Necker, St Antoine, La Pitié Salpétrière, Trousseau University Hospitals | France | Paris | Jerome Bertherat |
| Assistance Publique – Consortium Pitie Salpêtrière – French Reference Centre for Prader-Willi Syndrome | France | Paris | Christine Poitou |
| Assistance Publique – Consortium Pitie Salpêtrière Hospital, Necker Enfants Malades Hospital, Institut Mutualiste Montsouris – Rare Reproductive Endocrinology and Gynaecology Diseases (PGR) | France | Paris | Philippe Touraine |
| Hôpital Bicêtre | France | Paris | Philippe Chanson |
| Hôpital Universitaire Necker – Enfants malades | France | Paris | Michel Polak |
| CHU Toulouse | France | Toulouse | Maithe Tauber |
| University Hospital Aachen | Germany | Aachen | Thomas Eggermann |
| Charité Universitätsmedizin Berlin | Germany | Berlin | Joachim Spranger |
| 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 |
| University Hospital Würzburg | Germany | Wuerzburg | Martin Fassnacht |
| Semmelweis University | Hungary | Budapest | Miklos Toth |
| Azienda Ospedaliera Sant’Orsola Malpighi | Italy | Bologna | Alessandra Cassio |
| Meyer Children’s Hospital Florence | Italy | Florence | Sonia Toni |
| University Hospital Florence | Italy | Florence | Csilla Krausz |
| IRCCS A.O.U San Martino – Genova – (IT5) | Italy | Genua | Diego Ferone |
| Ospedale San Raffaele | Italy | Milan | Gianni Russo |
| Istituto Auxologico Italiano – Istituto di Ricovero e Cura a Carattere Scientifico | Italy | Milano | Luca Persani |
| Azienda Ospedaliera Universitaria “Federico II”, Napoli | Italy | Napels | Annamaria Colao |
| Azienda Ospedaliera di Padova (AOP) | Italy | Padova | Carla Scaroni |
| Azienda Ospedaliera Universitaria Pisana – Obesity Centre, Endocrinology Unit | Italy | Pisa | Ferruccio Santini |
| Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino | Italy | Turin | Ezio Ghigo |
| Hospital of Lithuanian University of Health Sciences Kauno Klinikos | Lithuania | Kaunas | Rasa Verkausiene |
| Centre Hospitalier de Luxembourg | Luxembourg | Luxemburg | Michael Witsch |
| Amsterdam-UMC, location AMC | Netherlands | Amsterdam | Eric Fliers |
| 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 | Robin Peeters |
| 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 |
| Public Pediatric Teaching Hospital | Poland | Warsaw | Agnieszka Szypowska |
| APDP – Diabetes Portugal | Portugal | Lisbon | João Raposo |
| 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 |
| University Medical Centre Ljubljana | Slovenia | Ljubljana | Tadej Battelino |
| Hospital Sant Joan de Déu Barcelona | Spain | Barcelona | Roque Cardona-Hernandez |
| Hospital Universitari Vall d’Hebron | Spain | Barcelona | Diego Yeste |
| Hospital Universitario Cruces | Spain | Bilbao | Sonia Gaztambide |
| Karolinska University Hospital | Sweden | Stockholm | Anna Nordenström |