Figure 5From: Temporal differences in gamma-hydroxybutyrate overdoses involving injecting drug users versus recreational drug users in Helsinki: a retrospective studyLocation of overdose in group A. Patients with serious GHB and GBL overdose treated by Helsinki EMS in 2006-2007. Group A: call to emergency dispatching centre made on Friday-Saturday or Saturday-Sunday night between 11 pm and 6 am. EMS: Emergency Medical Service, GHB: gammahydroxybutyrate, GBL: gammabutyrolactone.Back to article page