analysis of mobile phone use
Since I would imagine the lending of mobile phones to be unusual, I wonder
if the authors have overlooked a glaring objective measure of telephone
exposure. Cellular phone companies can give very accurate accounts of time
used. Even considering other factors such as hands-free equipment, why was
this not analysed? Doubtless the companies would have been keen to assist
if, as seems likely, their product would have been given the all clear.
Competing interests: No competing interests