In the performance of analytical studies epidemiologists move from the demanding chores of collecting accurate information into the realms of designing studies that seek to answer important individual questions about the causes of cancer. In this area they will usually have an idea to test – a hypothesis about some possible causative factor. The focus [...]
We are in an era of rapid change in the workplace. In the more industrialized parts of the world, the introduction of new technology is reducing the direct involvement of workers in manufacturing and the service sectors are expanding rapidly. There is therefore a trend towards white-collar working and this trend is likely to continue [...]
Cancer in the lungs causes difficulty in breathing. The job of the lungs is to put oxygen into the blood and take waste gases such as carbon dioxide out. If part of the lung is destroyed, the rest of the lung has to work harder to do this. This means the patient needs to breath [...]