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Hummel, Karin and Nagelhout, Gera E and Willemsen, Marc C and Driezen, Pete and Springvloet, Linda and Mons, Ute and Kunst, Anton E and Guignard, Romain and Allwright, Shane and van den Putte, Bas and Hoving, Ciska and Fong, Geoffrey T and McNeill, Ann and Siahpush, Mohammad and Vries, Hein de (2015) Trends and socioeconomic differences in policy triggers for thinking about quitting smoking: Findings from the International Tobacco Control (ITC) Europe Surveys. Drug and Alcohol Dependence , 155 , pp. 154-162.