Immune Dynamics in the Natural History of Chronic HBV Infection

"For adults (including those who are 18 years old): During the routine follow-up visits, an extra 30 milliliters of peripheral blood will be drawn.~For minors (under 18 years old): During the routine follow-up visits, an extra 6 milliliters of peripheral blood will be drawn.~Follow-ups will be conducted every six months, with a minimum of six visit points."