Studies have repeatedly found much geographic variation in use of surgical and diagnostic procedures. This study of the variability of medication use for specific conditions in eleven California regions finds surprisingly few differences among regions. The difference between the highest- and lowest-use areas was far less than we anticipated and amounted to only 30-40 percent for many drugs. We ...

This study was conducted to determine the geographic distribution of selenium deficiency among beef cows and heifers in selected states. Whole blood selenium concentrations were determined for cows and heifers on 253 cow-calf operations in 18 states. Overall, 7.8% of the samples were severely deficient, and another 10.4% of the samples were considered marginally deficient for selenium. Blood se...

A fundamental problem of future networks is to get fully selforganized routing protocols with good scalability properties that produce good paths in a wide range of network densities. Current approaches, geographic routing and table based routing, fail to provide very good scalability with good paths in sparse networks. We propose a method based on the discovery of connectivity between geograph...