Corrigendum: The incidence and clinical characteristics of fragile X syndrome in China - Mei, Lianni; Hu, Chunchun; Li, Dongyun; Wang, Ya; Li, Huiping; Zhang, Kaifeng; Zhou, Bingrui; Zhu, Ruoping; Hagerman, Randi J.; Xu, Xiu; Xu, Qiong (Frontiers in Pediatrics, 2023)