This tactile feedback is related to a difference in tis-sue density as one goes from the parenchyma to the vessels or from the parenchyma to the collecting sys-tem, and also to the selectivity of the CUSA to spare tissue of high collagen content.
1 In the least developed countries, the overall illiteracy rate is 49 percent. 2  52 percent of all non-literates live in India and China. 3  Africa as a continent has a literacy rate of less than 60 percent. 4  In Sub-Saharan Africa since 1980, primary school enrollment has declined, going from 58 percent to 50 percent.
Yet, according to the U.N. Food and Agriculture Organization (FAO), more than a quarter of Sub-Saharan Africaâs people are currently undernourished, and the region already imports roughly 20 percent of its staple calories.his challenge is particularly poignant in Sub-Saharan Africa. The regionâs population is on course to more than double from its current 0.9 billion by 2050 and quadruple to 3.9 billion people by 2100.