Clarifications on our review on estimating dose delivery accuracy in stereotactic body radiation therapy: A review of in-vivo measurement methods: In response to the letter of Kos. (December 2020) - Esposito, Marco; Villaggi, Elena; Bresciani, Sara; Cilla, Savino; Falco, Maria Daniela; Garibaldi, Cristina; Russo, Serenella; Talamonti, Cinzia; Stasi, Michele; Mancosu, Pietro