No association between vitamin D status and COVID-19 infection in São Paulo, Brazil oleh Cynthia M. Álvares Brandão, Maria Izabel Chiamolera, Rosa Paula Mello Biscolla, José Viana Lima Junior, Cláudia M De Francischi Ferrer, Wesley Heleno Prieto, Pedro de Sá Tavares Russo, José de Sá, Carolina dos Santos Lazari, Celso Francisco H. Granato, José Gilberto H Vieira