This paper investigates the impact of the US and China’s foreign aids to Africa on trade flows between donor and recipient countries. Evidence from the gravity model estimates reveals that the two donors’ exports are strengthened by their aids to African partners. Interestingly, China’s aid shows a positive effect on its total volume of trade and imports from Africa, while the aid from the US e...

background: trichomonas vaginalis , the causative agent of trichomoniasis, is responsible for more than half of all sexually transmitted infections (stis). the present study aimed to deter­mine the frequency of t. vaginalis infection and its clinical manifestations in sympto­matic pregnant women in the area based on four different diagnostic methods. methods: a total of 162 pregnant women with ...

background: exposure to respirable particulate matter containing silica in the working environment can lead to respiratory diseases and other health hazards. the current study was designed to estimate the prevalence of lung diseases and their determining factors in the stone carvers of kerman, iran.   materials and methods: this was a cross-sectional study in which 67 male workers exposed to st...

welding is one of the key components of numerous manufacturing industries, which has potential physical and chemical health hazards. many components of welding fumes can potentially affect the lung function. this study investigates the effects of welding fumes on lung function and respiratory symptoms among welders of an automobile manufacturing plant in iran. this historical cohort study asses...