The researchers reviewed studies published in 1993, 1998 and 2003.
The researchers review the article and assess the quality of the science.
Researchers reviewed the experiences of 50 children who had taken 91 flights.
Researchers reviewed 143 studies comprising more than 365,000 participants from 19 countries.
The researchers also reviewed Pennsylvania death certificates for the period.
The researchers reviewed first-time strokes among about 13,000 people from 1991 to 1996.
The researchers reviewed the death certificates for all police officers who had died during the 20 years covered by the study.
Next, the researchers reviewed similar data on more than 500 healthy women without a history of kidney infections.
In the study, researchers reviewed research on meditation and other types of relaxation techniques.
The researchers also reviewed police crash reports, hospital records, and coroners?