Association between Vitamin D and COVID-19: a systematic review and meta-analysis
Paulo R Bignardi, PhDa, Paula de Andrade Castelloa, Bruno de Matos Aquinoa
Affiliations:
aSchool of Medicine, Pontifícia Universidade Católica do Paraná, Londrina, Brazil
* Correspondence author: Prof. Paulo R. Bignardi. e-mail: pbignardi@gmail.com, School of Medicine. Address: 485 Jockey Club ave – Hípica – Londrina – Paraná – Brazil, Zip code 86072-360