background: despite the availability of an effective vaccine for more than three decades, hbv (hepatitis b virus) continues to infect many people worldwide, particularly in developing countries of asia. in older people at higher risk of infection, high prevalence of hbv may exist, particularly among intravenous drug users (idus). this group is among groups at higher risk of infection as they sh...

Background. Recent research has proposed that environmental factors affect the development of expertise. Objectives. The present study aimed to compare the history of training activities amongst expert athletes of different sport disciplines regarding the level of risk. Methods. Participants included 187 athletes from six sports disciplines, which were allocated to "low-risk," "medium risk," o...