Fig. 2From: Psychosocial factors associated with overdose subsequent to Illicit Drug use: a systematic review and narrative synthesisThematic groups of factors found to impact on experience of overdose in reviewed studies (n = 103)Note: N in each circle is the number of factors within that thematic group. Groups with smaller N are smaller circles, while groups with the same N are the same colour. Groups are randomly scattered as there is no inherent hierarchy or linearity to their impactBack to article page