Concern particularly relating to children and adolescents originates from the likelihood that, if an increased risk exists, it could be greater for exposure at younger ages due to: increased sensitivity of the developing neurological system to effects of RF signals; higher estimated specific absorption rate (SAR) in chil- dren (due to a thinner skull and ears compared to adults) (8); and greater lifetime cumulative exposure compared to those who began mobile phone use in adulthood.