Maternal Singing but Not Speech Enhances Vagal Activity in Preterm Infants during Hospitalization: Preliminary Results oleh Manuela Filippa, Mimma Nardelli, Elisa Della Casa, Alberto Berardi, Odoardo Picciolini, Sara Meloni, Clara Lunardi, Alessandra Cecchi, Alessandra Sansavini, Luigi Corvaglia, Enzo Pasquale Scilingo, Fabrizio Ferrari, EVC Group