ObjectiveTo study the current status of hemophilia B (HB) patients in the central and western regions of China. MethodsThis cross-sectional. multicenter study was conducted in seven provinces in the central and western regions of China from April 2019 to June 2023. Samples were collected for the factor IX activity. https://www.nacrack.com/huge-sale-Moondrop-Quarks-quick-choice/