Author Correction: Randomized trial of influence of vitamin D on the prevention and improvement of symptomatic COVID-19 - Huan Wang; Liyuan Tao; Liyan Cui; Yahong Chen; Dongyang Liu; Lixiang Xue; Yuping Yang; Yang Lv; Fuchun Zhang; Tiancheng Wang; Xiaoxiao Wang; Wanqiong Yuan; et al. (Scientific Reports)