Serum 25-hydroxyvitamin D measurement: Comparative evaluation of three automated immunoassays oleh Francesca Trimboli, Salvatore Rotundo, Simone Armili, Selena Mimmi, Fortunata Lucia, Nicola Montenegro, Giulio Cesare Antico, Alessandro Cerra, Maria Gaetano, Francesco Galato, Lorenza Giaquinto Carinci, Danilo Iania, Serafina Mancuso, Maria Martucci, Consuelo Teti, Marta Greco, Giovanni Cuda, Elvira Angotti