Inclusion Criteria:  Subjects eligible for this study must meet all of the following criteria:  ≥18 years of age; Signed informed consent form; Patients receiving GV-971 treatment prescribed by clinicians;  Exclusion Criteria:  A subject may be excluded from participation in the study if any of the following apply:  Patients who may be allergic to Sodium Oligomannate Capsules as judged by the investigator; Female participants who are pregnant or lactating; Patients who cannot cooperate to complete the follow-up inquiries; Any other diseases or conditions that are inappropriate to participate in this clinical trial in the opinion of the investigator.