Objective To understand the prevalence,consequences and risk factors of falls among urban community-dwelling elderly in Beijing. Methods A cross-sectional study
Two complete specimens from the Pelsonian(Middle Anisian,Middle Triassic)of Luoping, Yunnan Province,South China are referred to a new actinopterygian genus,Luo
Issues of scale and aggregation become important when large range of space and time scales is considered in landscape models.However,identifying appropriate lev