The qualifying criteria for population health research participants (Inclusion criteria)1. patients were treated in accident and emergency rooms with symptoms they were from drug use tramadol at the age of 12 – 60 years during January 1, 2012 – September 30, 2014.2. the patient has a history of symptoms occurs happy at being treated in accident and emergency at the age of 12 – 60 years during January 1, 2012 – September 30, 2014.
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