VDR and COVID-19: Two VDR polymorphisms included in the present data synthesis were not among variants found to associate with severe COVID-19 in a large study conducted in the UAE (Al-Anouti et al., 2021[5]), or in studies conducted on Iranian, Serbian and Cuban COVID-19 patients (Abdollahzadeh et al., 2021[1]; Kotur et al., 2021[27]; Peralta et al., 2021[39]).