Dr Fabien Claude studied medicine in Lausanne and graduated in 2013. He trained in paediatrics in both Italian- and German-speaking parts of Switzerland and obtained his board certification in 2019. Thereafter, he started a clinical fellowship in paediatric Endocrinology and Diabetology at the Unit of Prof U. Zumsteg and Prof Szinnai at the University Children’s Hospital (UKBB) in Basel. He also spent 6 months at the paediatric Endocrinology Unit of Prof M. Cappa at the Bambino Gesù Children’s Hospital in Rome. Meanwhile, he has the opportunity to collaborate in the research project of Prof G. Szinnai and Prof M. Pfister “OptiThyDose: Intelligent Digital Decision Support Tool to Personalise Dosing for Children with Thyroid Diseases”.