Optimization of Extraction Technology of Effective Components From Hawthorn Leaves and Assessment of Antioxidant Activity Study on self-microemulsifying membrane controlled-release drop pill of hawthorn leaves flavonoids Determination of rhamnosylvitexin in hawthorn leaves flavonoids phospholipid complex by HPLC Influencing factors on stability of hawthorn leaves total flavonoids-phospholipid complex Influencing factors on stability of hawthorn leaves total flavonoids-phospholipid complex Self-microemulsifying drug delivery system of flavonoids in hawthorn leaves