| http://www.w3.org/ns/prov#value | - Furthermore, it is unclear whether ME affects only mood or also other aspects such as self-esteem or self-representation.Previous studies among high school and university students using anonymous questionnaires (AQ) have shown prevalence rates for the use of prescription stimulants (MPH) to be 0.8% and 2.9% for illicit stimulants (AMPH) whereas 10.5% decided to use caffeine tablets for CE [27,30,3
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