HBsAg Declined Patients Follow-up Study

The goal of this observational study is to prospectively follow chronic hepatitis B patients who had HBsAg decline in the past 12 months prior to screening. The main question it aims to answer are: \- Describe treatment pattern and its impact on HBsAg loss in hepatitis B patients who had HBsAg decline in past 12 months due to any reason (with or without new molecular entities therapy). Participants will be followed up for 36 months after enrollment and may be extended upon expiration according to study objectives.