PDF - http://press.psprings.co.uk/bmj/february/ecstasy.pdf
Anja C Huizink, Robert F Ferdinand, Jan van der Ende, Frank C Verhulst
"bjective To investigate whether using ecstasy (3,4-methylenedioxymethamphetamine, MDMA) is preceded by symptoms of behavioural and emotional problems in
childhood and early adolescence.
Design Prospective, longitudinal, population based study
Setting The Dutch province of Zuid-Holland.
Participants A sample of 1580 individuals, followed up across a 14 year period, from childhood into adulthood."
