Figure 4From: Temporal differences in gamma-hydroxybutyrate overdoses involving injecting drug users versus recreational drug users in Helsinki: a retrospective studyConcomitantly used substances in group B. Patients with serious GHB and GBL overdose treated by Helsinki EMS in 2006-2007. Group B: call to emergency dispatching centre made outside the time frame of weekend nights. EMS: Emergency Medical Service, MDMA: 3, 4-methylenedioxymethamphetamine.Back to article page