The trial was
performed in the City of Pori, at the Medical Teaching and
Research Health Centre of the Department of Family Medicine,
University of Turku.
and psychosocial support during the 1 month withdrawal
period. To evaluate the persistence of withdrawal
results, a 5 month follow-up was performed. Short term
withdrawal symptoms during the first month’s withdrawal
period, long term withdrawal symptoms during the
follow-up period and adverse events were assessed blindly
in both groups.