RT Article T1 Essential/precursor chemicals and drug consumption: Impacts of US sodium permanganate and Mexico pseudoephedrine controls on the numbers of US cocaine and methamphetamine users JF Addiction VO 111 IS 11 SP 1999 OP 2009 A1 Cunningham, James K. A1 Callaghan, Russell C. A1 Liu, Lon-mu A2 Callaghan, Russell C. A2 Liu, Lon-mu LA English YR 2016 UL https://krimdok.uni-tuebingen.de/Record/1912540037 DO 10.1111/add.13480