Maastricht University, University of Copenhagen - Nordsjællands Hospital, University of Bern, Maastricht University, Otto-von-Guericke University, P & A Kyriakou´ Children's Hospital, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, Maastricht University, Maastricht University - Department of Clinical Epidemiology and Medical Technology Assessment, Debiotech SA, University of Bern, Nordsjællands Hospital - Department of Endocrinology and Nephrology, Maastricht University - Department of Internal Medicine and Independent