Observed transition from opioid analgesic deaths toward heroin.
Drug Alcohol Depend. 2014 Dec 1;145:238-41.
Urban overdose hotspots: a 12-month prospective study in Dublin ambulance services.
Am J Emerg Med. 2014 Oct 1;32(10):1168-73.
J Gen Intern Med. 2013 Apr 1; 28 (4): 522529522-9.