Hidden dangers-prevalence of blood borne pathogens, hepatitis B, C, HIV and syphilis, among blood donors in Sierra Leone in 2016: opportunities for improvement: a retrospective, cross-sectional study

2016年塞拉利昂献血者中血液传播病原体（乙型肝炎、丙型肝炎、艾滋病毒和梅毒）的隐患：改进的机会：一项回顾性横断面研究