Feasibility of using real-world free thyroxine data from the US and Europe to enable fast and efficient transfer of reference intervals from one population to another oleh Hedwig Kurka, Peter Dilba, Carlos Castillo Perez, Peter Findeisen, Ignacio Gadea Gironés, Alex Katayev, Laura Rodríguez Alonso, André Valcour, Thorsten Rehberg, Benedikt Weber, Horst Donner, Anja Thorenz