Safety and efficacy of a new supplementation protocol in patients with cystic fibrosis and vitamin D deficiency Carmen Mangas-Sánchez; María Garriga-García; María Juliana Serrano-Nieto; Ruth Garcia-Romero; Marina Álvarez Beltrán; Elena Crehuá-Gaudiza; Saioa Vicente-Santamaría; Cecilia Martínez-Costa; Juan José Díaz-Martín; Carlos Bousoño-García; David González-Jiménez;