DMD and Becker muscular dystrophy: Because of the suspected BMD diagnosis of our enrolled boy, we initiated exon DNA-based genetic testing to look for DMD gene variants that contribute to the disease (Xie et al., 2023; Xie et al., 2021), including multiplex ligation-dependent probe amplification (MLPA) analysis to detect deletions or duplications in exons of the DMD gene and NGS.