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Radio frequency electromagnetic fields (EMFs) emitted by cell phones cause an increase in blood pressure, concludes a new study conducted by Dr. S. Braune and his colleagues of the University Neurology Clinic in Freiburg, Germany, and published in the British Medical Journal, Lancet. 

Dr. Braune found a significant elevation in both systolic and diastolic blood pressure after exposure to EMFs compared with the unexposed session. They concluded that the increase in blood pressure readings only occurred in those test subjects using cell phones. They concluded that the increase in blood pressure resulted from constriction of the arteries caused by radiofrequency electromagnetic fields and that such an increase could have adverse effects on people with high blood pressure.

Link to research paper (subscription required)