Nombre investigadores: Veronica Sansoni, Giovanni Lombardi, Jorge Díaz-Garzón, Pilar Fernández Calle, William A Bartlett, Abdurrahman Coşkun, Outi Itkonen, Niels Jonker, Sverre Sandberg, Aasne K Aarsand, Giuseppe Banfi, Anna Carobene; European Federation of Clinical Chemistry; Laboratory Medicine Working Group on Biological Variation