11.   Other factors include two years of drought, acid rain, run-off from contaminated land and reduced governmental expenditure on sewage treatment.

12.   These factors may include the baby being too hot because of another viral infection, wearing too many clothes or sleeping on its stomach rather than its back.

13.   External factors include excessive heat or poor ventilation.

14.   Contributing factors include poor nutrition, pain, reactions from analgesic medications used to treat pain, anemia and underlying infections.

15.   Contributing factors include the likelihood of easier approvals of drugs through the first Europe-wide approval agency, the European Agency for the Evaluation of Medicinal Products.

16.   Factors include a slower economy, the cost of hiring professionals and the continued interest among consumers in do-it-yourself projects, the study noted.

17.   Factors include technological advances and higher drug costs.

18.   Factors include greater willingness to seek help, less family support and higher risk of alcoholism and substance abuse.

19.   Factors include volume of traffic and number of accidents.

20.   In addition to a sedentary life, these factors include high blood pressure, diabetes, elevated cholesterol levels, cigarette smoking and obesity.