The evident and the hidden factors of vitamin D status in older people during COVID-19 pandemic - Azevedo, Paula Schmidt; Fock, Ricardo Ambrósio; Pereira, Filipe Leal; Santos, Priscila Portugal dos; Ferro, Flavio Cruz; Sacco, Nataly; Polegato, Bertha Furlan; Zornoff, Leonardo Antônio Mamede; Okoshi, Marina Politi; Achterberg, Wilco; Paiva, Sergio Rupp de (Nutrire, 2021)