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Author Question: When conducting survey research, why would one need to make sure the sample is "stratified"? (Read 55 times) |
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.