Increased Presence of Fentanyl in Cocaine Involved Fatal Overdoses: Implications for Prevention 
            
                    
                    
                    
                    
                
        
                    Journal Urban Health, 11 January 2019; M.L Nolan et al.
                    
                    
                        
                        
                                                
                         
                        
                            
                
                 
                        
                        
                     
          
                            Jan
                              2019
              
                
                        
                            This study aims to determine the contribution of opioids, and fentanyl in particular, to the increase in cocaine-involved overdose death from 2015 to 2016.
                        
                    