Inclusion Criteria:  Any of the following are true:  Currently has a confirmed diagnosis of DMD/BMD based on genetic testing, muscle biopsy, or clinical diagnosis. Currently has a confirmed diagnosis of carrier status for DMD/BMD based on genetic testing. Parent/guardian (for minor participants) or participant gives informed consent and/or assent as required by local regulations. Is age 4 weeks or older at the time of consent.  Exclusion Criteria:  Is a foster child or ward of the state. Is a prisoner.