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BACKGROUND Empirical evidence suggests that the prevalence of soil-transmitted helminth (STH) infections in remote and poor rural areas is still high among children, the most vulnerable to infection. There is concern that STH infections may detrimentally affect children's healthy development, including their cognitive ability, nutritional status, and school(More)
The Session Initiation Protocol (SIP), which is wildly used for IP-based multimedia communication, is an application-layer protocol to handle sessions between two points. SIP is implemented on the top of user datagram protocol (UDP) or transmission control protocol (TCP). This study proposed a Colored Petri Nets (CPN) based formal model of the INVITE(More)
This paper examines the prevalence of vision problems and the accessibility to and quality of vision care in rural China. We obtained data from 4 sources: 1) the National Rural Vision Care Survey; 2) the Private Optometrists Survey; 3) the County Hospital Eye Care Survey; and 4) the Rural School Vision Care Survey. The data from each of the surveys were(More)
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