Hublet, Anne and Bendtsen, Pernille and de Looze, Margaretha and Fotiou, Anastasios and Donnelly, Peter and Vilhjalmsson, Runar and Baska, Tibor and Aasvee, Katrin and Franelic, Iva Pejnovic and Nic Gabhainn, Saoirse and ter Bogt, Tom (2015) Trends in the co-occurrence of tobacco and cannabis use in 15-year-olds from 2002 to 2010 in 28 countries of Europe and North America. European Journal of Public Health, 25, (Supplement 2), pp. 73-75. doi: 10.1093/eurpub/ckv032.