Corrigendum: Accuracy of the Horizontal Calibrator in Correcting Leg Length and Restoring Femoral Offset in Total Hip Arthroplasty - Chen, Xing; Xing, Shuxing; Zhu, Zhiyong; Wang, Huisheng; Yu, Zhongshen; Bai, Xizhuang; Li, Xi (Frontiers in Surgery, 2022)