We'd like to offer you the job <a href=" http://www.workingfamilies.org.uk/real-viagra-discount.pdf ">genericos do viagra</a> The researchers believe that the large differences in screening rates between different European countries are due to a number of factors. "First, many countries still do not have a national CRC screening programme. Second, the acceptability of screening methods is often low, sometimes due to cultural differences between countries. There is also the question of the availability of qualified personnel. In some countries, there are insufficient gastroenterologists available to perform endoscopy. Even with FOBT screening, an endoscopy is needed if the test is positive," says Prof Autier.