Putative Role of Vitamin D for COVID-19 Vaccination. - Chiu, Sheng-Kang; Tsai, Kuo-Wang; Wu, Chia-Chao; Zheng, Cai-Mei; Yang, Chung-Hsiang; Hu, Wan-Chung; Hou, Yi-Chou; Lu, Kuo-Cheng; Chao, You-Chen (International Journal of Molecular Sciences, 2021)