Corrigendum: Reduced serum calcium is associated with a higher risk of retinopathy in non-diabetic individuals: The Chinese Multi-provincial Cohort Study - Li, Jiangtao; Zhao, Dong; Deng, Qiuju; Hao, Yongchen; Wang, Miao; Sun, Jiayi; Liu, Jun; Ren, Guandi; Li, Huiqi; Qi, Yue; Liu, Jing (Frontiers in Endocrinology, 2022)