Natale E., Frau P., Pavese C., Fussi F. (2023) "Impact of masks on voice in COVID-19 era: a vocal hygiene protocol to reduce voice fatigue in a population of speech therapists. (A proposal by G.I.Vo.C.)" Audiologia e Foniatria, 8(2), 16-24. DOI: 10.14658/pupj-IJAP-2023-2-3