Socías ME, Choi J, Lake S, Wood E, Valleriani J, Hayashi K, Kerr T, Milloy MJ Corrigendum to 'Cannabis use is associated with reduced risk of exposure to fentanyl among people on opioid agonist therapy during a community-wide overdose crisis' [Drug Alcohol Depend. 219 (2021) 108420] Drug Alcohol Depend PubMed